This is the largest waterfall on Maui, Hawaii. The Pipiwai Trail follows the Pipiwai Stream and is one of the best hikes on Maui. It is 4 miles roundtrip, gaining 650-feet in elevation. It takes 2 1/2 - 5 hours to hike. The final destination is the fantastic Waimoku Falls. This gigantic waterfall drops 400-feet down a sheer lava rock wall into a boulder-strewn pool.