You can take time to visit Lower Calf Creek Falls Trailhed during your travels to Boulder. While you're in the area, wander around the natural setting.
Explore the great outdoors at Calf Creek Recreation Area, a lovely green space in Boulder. You can seek out the hiking trails while in the area.
You can spend an afternoon studying the exhibits at Anasazi State Park during your travels in Boulder. While you're in the area, wander around the parks.