In my mind, this is the ultimate waterfall hike in the islands. Hi’ilawe Falls is a 2,000 foot cataract that booms into a semi-circular eroded volcanic bowl in Waipio Valley, a large, remote valley on the Hamakua Coast of the Big Island near the town of Honoka’a. At the base of the falls is a swimming hole with waters shaded a surreal shade of deep-green blue.