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The ISO by Castle

3.5 star property
3.5-star beachfront resort with outdoor pool

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Photo gallery for The ISO by Castle

Outdoor pool
Beach House Suite (2nd floor, stair access only) | Beach/ocean view
One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette | Fridge, coffee/tea maker
Beach House Suite (2nd floor, stair access only) | Balcony view
One Bedroom Ocean View (2nd Floor, stair access only) | Living room | 42-inch flat-screen TV with cable channels, TV

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning
  • Pool
  • Restaurant

Explore the area

View in a map
4-796 Kuhio Hwy, Kapaa, HI, 96746
  • Waipouli Beach
    ‪3 min walk‬
  • Coconut Marketplace
    ‪14 min walk‬
  • Lae Nani Beach
    ‪3 min drive‬
  • Lihue, HI (LIH)
    ‪15 min drive‬

Room options

View all photos for Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only) | 1 bedroom, laptop workspace, blackout drapes, Internet

Ocean Front View (1st - 3rd Upper Floors, stair access only)

7.8 out of 10
Good
(30 reviews)
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Deluxe Room, Ocean View (2nd Floor - stair access only)

Deluxe Room, Ocean View (2nd Floor - stair access only) | Living area | 42-inch flat-screen TV with cable channels, TV

Deluxe Room, Ocean View (2nd Floor - stair access only)

7.8 out of 10
Good
(14 reviews)
  • 290 sq ft
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed OR 2 Double Beds

View all photos for Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only) | View from room

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

9.6 out of 10
Exceptional
(5 reviews)
  • 290 sq ft
  • Partial ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean View (1st - 3rd Upper Floors, stair access only

1 bedroom, laptop workspace, blackout drapes, Internet

Ocean View (1st - 3rd Upper Floors, stair access only

8.6 out of 10
Excellent
(62 reviews)
  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Beach House Suite (2nd floor, stair access only)

Beach House Suite (2nd floor, stair access only) | Living area | 42-inch flat-screen TV with cable channels, TV

Beach House Suite (2nd floor, stair access only)

10.0 out of 10
Exceptional
(1 review)
  • 640 sq ft
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Queen Sofa Bed

View all photos for One Bedroom Ocean View (2nd Floor, stair access only)

One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette | Fridge, coffee/tea maker

One Bedroom Ocean View (2nd Floor, stair access only)

9.0 out of 10
Wonderful
(2 reviews)
  • 580 sq ft
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed

View all photos for Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only) | 1 bedroom, laptop workspace, blackout drapes, Internet

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

  • 290 sq ft
  • Ocean view
  • Sleeps 3
  • 1 King Bed

About the neighborhood

Kapaa

On the beach.With a stay at this Waipouli resort, you'll be within half a mile (1 km) of Waipouli Beach and 2 miles (3 km) of Coconut Marketplace. Fuji Beach and Kapaa Shopping Center are also within 2 miles (3 km).
View more Resorts in KapaaOpens in a new window

What's nearby

  • Waipouli Beach - 3 min walk - 0.2 miles
  • Coconut Marketplace - 14 min walk - 0.7 miles
  • Lae Nani Beach - 3 min drive - 1.0 mile
  • Kapa'a Beach Park - 4 min drive - 1.7 miles
  • Smith's Tropical Paradise - 6 min drive - 1.9 miles

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

  • ‪McDonald's - ‬4 min walk
  • ‪Starbucks - ‬6 min walk
  • ‪BV's Bourbon & Ale House - ‬16 min walk
  • ‪Burger King - ‬18 min walk
  • ‪JoJo’s Shave Ice - ‬15 min walk

About this property

The ISO by Castle

3.5-star beachfront resort with outdoor pool
There's a restaurant on site. You can enjoy a drink at the bar/lounge. The ISO by Castle also features an outdoor pool, a garden, and a water dispenser.

This 3.5-star Kapaa resort is smoke free.

  • 78 guestrooms or units
  • 3 levels
  • 5 buildings
  • Front desk (limited hours)
  • Garden
  • No smoking on site
  • Water dispenser
  • Bar or lounge
  • Dining venue
The ISO by Castle offers 78 air-conditioned accommodations with complimentary toiletries and ceiling fans. Rooms open to balconies. 42-inch flat-screen televisions come with cable channels. Guests can make use of the in-room refrigerators and coffee/tea makers. Bathrooms include shower/tub combinations.

Similar properties

Balcony

Aston Islander on the Beach

  • Pool
  • Air conditioning
  • Bar
  • Laundry
4.3 out of 5, Excellent, 1,011 reviews
$199 nightly
The price is $235
Sep 23 - Sep 24
Total with taxes and fees
Aston Islander on the Beach

Property amenities

Family friendly

  • In-room refrigerator
  • Outdoor pool

Internet

  • Available in all rooms: High-speed internet

Food and drink

  • A bar/lounge
  • A restaurant

Things to do

  • Bicycle rentals
  • Outdoor pool
  • Snorkeling
  • Yoga classes

Accessibility

  • No elevator

Room amenities

Entertainment

  • 42-inch flat-screen TV with cable channels

Bedroom

  • Bedsheets provided
  • Blackout drapes

Bathroom

  • Free toiletries
  • Private bathroom
  • Shower/bathtub combination
  • Towels provided

Food and drink

  • Coffee/tea maker
  • Refrigerator

More

  • Air conditioning
  • Ceiling fan
  • Laptop workspace

Policies

Check-in

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM
Minimum check-in age: 18

Check-out

Check-out before 11 AM
Late check-out subject to availability
A late check-out fee will be charged

Special check-in instructions

The front desk is open daily from 7:00 AM - 10:00 PM
Front desk staffed during limited hours

Access methods

Front desk (limited hours)

Pets

  • No pets allowed

Children and extra beds

  • Children are welcome.
  • Rollaway/extra beds are not available.

Property payment types

Important information

Fees

Guests will be asked to pay the following charges at the property:

  • Resort fee: USD 35.38 per accommodation, per night
The resort fee includes:
  • Additional inclusions
  • Fitness/yoga classes
  • Newspaper
  • Parking
  • Self parking
  • WiFi access (may be limited)

We've listed all charges provided to us by the property.

Optional extras

The fees and deposits listed below will be charged at the time of service, check-in, or check-out.

  • Late check-out is available for a fee (subject to availability)

This may not be a comprehensive list. Fees and deposits are subject to change and might not include tax.

You need to know

Extra-person charges may apply and vary depending on property policy
Government-issued photo identification and a credit card, debit card, or cash deposit may be required at check-in for incidental charges
Special requests are subject to availability upon check-in and may incur additional charges; special requests cannot be guaranteed
Tax ID - W-34434930-01
This property accepts credit cards and debit cards; cash is not accepted
Safety features at this property include a smoke detector
This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children; if you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room
Charges for extra guests may apply and vary according to property policy.
A cash deposit, credit card, or debit card for incidental charges and government-issued photo identification may be required upon check-in.
Special requests are subject to availability at the time of check-in. Special requests can't be guaranteed and may incur additional charges.
    This property is managed by a professional host. The provision of housing is linked to their trade, business, or profession. This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children. If you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room. The tax ID number is W-34434930-01. This property accepts Visa, Mastercard, American Express, Discover, and debit cards. Cash is not accepted. For guests' safety, the property includes a smoke detector in each accommodation.

We should mention

  • Registered guests are the only ones allowed to be in guestrooms.

Property is also known as

Castle Mokihana
Castle Mokihana Hotel
Castle Mokihana Hotel Kapaa
Castle Mokihana Kapaa
Mokihana Of Kauai Hotel Kapaa
ISO. Island. Sky. Ocean. Resort Kapaa
ISO. Island. Sky. Ocean. Resort
ISO. Island. Sky. Ocean. Kapaa
ISO. Island. Sky. Ocean.
ISO Sky Ocean Resort Kapaa
The ISO by Castle Kapaa
The ISO by Castle Resort
The ISO. Island. Sky. Ocean.
The ISO by Castle Resort Kapaa

Frequently asked questions

How close is The ISO by Castle to the airport?

The ISO by Castle is 7 mi (14-min drive) away from the Lihue Airport (LIH) airport, the closest popular airport to the property.

How much does it cost to stay at The ISO by Castle?

As of Sep 9, 2025, prices found for a 1-night stay for 2 adults at The ISO by Castle on Oct 1, 2025 start from $258.49, excluding taxes and fees. This price is based on the lowest nightly price found in the last 24 hours for stays in the next 30 days. Prices are subject to change. Choose your dates for more accurate prices.

Does The ISO by Castle have an airport shuttle?

Airport shuttle services are not available at The ISO by Castle.

How close is The ISO by Castle to the beach?

This resort is on the beach. Don't forget your sunscreen!

Does The ISO by Castle offer free breakfast?

The ISO by Castle does not offer free breakfast.

Is there a casino at The ISO by Castle?

No, there is no casino at this resort.

What time is check-in at The ISO by Castle?

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM.

Is there free parking at The ISO by Castle?

Free parking is not available at this resort.

Does The ISO by Castle have a pool?

The ISO by Castle features an outdoor pool.

Does The ISO by Castle have a restaurant?

The ISO by Castle is home to The Bullshed Restaurant, which features local cuisine and a beachfront location.

Does The ISO by Castle have a spa?

There are no spa services available at this resort.

How close is The ISO by Castle to downtown Kapaa?

The ISO by Castle is 1.2 mi away from Wailua.

Reviews

The ISO by Castle Reviews

8.4

Very Good

8.8/10

Cleanliness

8.4/10

Staff & service

8.0/10

Amenities

8.2/10

Property conditions & facilities

8.4/10

Eco-friendliness
Rating 10 - Excellent. 476 out of 1003 reviews
Rating 8 - Good. 335 out of 1003 reviews
Rating 6 - Okay. 121 out of 1003 reviews
Rating 4 - Poor. 42 out of 1003 reviews
Rating 2 - Terrible. 29 out of 1003 reviews

Reviews

8/10 Good

Maitland E

Liked: Cleanliness, amenities
Overall I enjoyed my stay. The views were gorgeous. Everything was clean. The pool was great and the beach access there was awesome. All the staff was lovely as well. There were just some maintenance that would really round out the entire experience.
Stayed 8 nights in May 2025

10/10 Excellent

Raymond, Bozeman

Stayed 1 night in May 2025

10/10 Excellent

Irvin

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
amazing view nice hotel
Stayed 4 nights in May 2025

10/10 Excellent

sophia

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
It was just what I needed. Cozy bed, ocean waves lull me to sleep, Bullshed great dinner and a hot shower. Awesome a R&R
Stayed 1 night in May 2025

10/10 Excellent

jeffrey

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort

beautiful view

everything at the hotel was perfect , except the breakfast.Too much sugar items
Stayed 8 nights in May 2025

10/10 Excellent

Kyle

Liked: Cleanliness, staff & service, property conditions & facilities
Our stay was great! The ISO is in a great location within walking distance to several beaches and food options.
Stayed 2 nights in May 2025

6/10 Okay

Stacie

Stayed 3 nights in May 2025

10/10 Excellent

Taysha

Stayed 2 nights in May 2025

8/10 Good

Steve

Stayed 4 nights in Apr 2025

10/10 Excellent

Diana

Liked: Amenities
Super friendly staff. Great view. Free bikes and yoga
Stayed 2 nights in May 2025

10/10 Excellent

Marjorie

Stayed 4 nights in Apr 2025

8/10 Good

Mark

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort

Great service

Had some trouble with our room after the first night. They upgraded us to a new room with a better view! Grab and run cold breakfast was a great option! Restaurant is a little pricey but the food was excellent.
Stayed 6 nights in Apr 2025

10/10 Excellent

leyla

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 4 nights in Apr 2025

10/10 Excellent

Celina

Liked: Cleanliness, staff & service, property conditions & facilities
Great location, friendly staff, good amenities
Stayed 4 nights in Apr 2025

10/10 Excellent

Verified traveler

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 2 nights in Apr 2025

10/10 Excellent

Serine

Traveled with family
Liked: Cleanliness, staff & service, amenities, property conditions & facilities
We love the ISO! The proximity of the ocean, the quiet enjoyment of the phenomenal view, and the sunrise from the rooms are priceless. Great location, friendly stuff, and pleasant stay to enjoy this wonderful island!
Stayed 7 nights in Apr 2025

4/10 Poor

RaLinda Rae

Stayed 7 nights in Jan 2025

8/10 Good

Nikola

Liked: Cleanliness, staff & service, property conditions & facilities
Stayed 1 night in Apr 2025

10/10 Excellent

Natania Delfin

Traveled with partner
Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Quiet, serene and conveniently located.
Stayed 3 nights in Apr 2025

10/10 Excellent

Linda

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 2 nights in Mar 2025

10/10 Excellent

Stephanie

Traveled with family
Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 1 night in Apr 2025

10/10 Excellent

Verified traveler

Traveled with family
Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 3 nights in Apr 2025

10/10 Excellent

Taysha

Stayed 3 nights in Apr 2025

8/10 Good

Anita

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort

Nice

Pleasant stay. Clean and comfortable. Staff was excellent, very accomodating. Beautiful ocean view.
Stayed 1 night in Apr 2025

10/10 Excellent

Verified traveler

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 3 nights in Mar 2025