Wailua River Kayaking
Kayak up the Wailua River, the only navigable river in Hawaii, through a lush jungle setting to a short trail that leads to Uluwehi Falls, universally called Secret Falls. The river paddle is about two miles each way and is calm and easy even for beginners, and the waterfall at the end drops 120 feet into a pool you can swim in. Guided tours and self-guided rentals are both available. Check the day before anything else: there is no kayaking on the Wailua on Sundays, for guided trips or private boats alike, and it catches out a lot of visitors. Since February 2026 Wailua River State Park also charges a state entry fee for non-residents and operates paid parking, both card only. The trail to the falls is muddy and involves a stream crossing, so expect everyone to come back filthy.