After visiting Koldinghus, make a plan to see the other sights and activities in Kolding. Wander the parks and gardens while you're in the area.
You can enjoy some culture when you stop by Danish Museum of Nursing History in Kolding. Amble around the area's forest or visit its churches.
You can spend an afternoon studying the exhibits at Trapholt Museum during your trip to Kolding. While you're in the area, wander around the gardens.