Rainbow Falls (Waiānuenue)

The cave behind the falls is sacred. Hawaiian moʻolelo identifies it as the dwelling place of Hina, mother of the demigod Maui. Do not climb past the railing or attempt to access the cave — multiple deaths over the years from people going off-trail; the Wailuku River has dangerous currents. Do not throw anything into the falls or stack rocks at the overlook. Reef-safe sunscreen if you are continuing to other water sites afterward. Parking lot fills mid-morning on weekends and high-season days; arrive early or expect to wait.