This 400-acre botanical garden at the foot of the steepled Koolau Range is the perfect place for a picnic. Its name means “a peaceful refuge,” and that’s exactly what the Army Corps of Engineers created when they installed a flood-control project here, which resulted in a 32-acre freshwater lake and garden. Just unfold a beach mat, lie back, and watch the clouds race across the rippled cliffs of the majestic Koolau Mountains. This is one of the few public places on Oahu that provides a close-up view of the steepled cliffs. The park has hiking trails and a lovely, quiet campground. If you like hiking and nature, plan to spend at least a half-day here. Note: Be prepared for rain, mud, and mosquitoes.