Waimoku Falls is at the head of the Pipiwai Trail, above Seven Sacred Pools on the Road to Hana. The hike to Waimoku Falls passes the 185 foot Makahiku Falls (which is also beautiful) at about half a mile into the trail.
The trail follows the Pipiwai Stream and is one of the best hikes on Maui. It is 4 miles round-trip, gaining 650-feet in elevation. It takes 2 1/2 - 5 hours to hike, depending on how much nature loving you do. 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; this is the tallest falls on Maui.
Be sure to wear sturdy shoes. Muddy conditions are also probable. Use extreme caution when crossing the stream(s) as well.
This spot is absolutely beautiful and more than well worth the hike to get to it. The bamboo forest is about the mid way point, and believe me, you'll know when you're there - it's almost as if you've left the island for Thailand. The sound the wind makes blowing through the bamboo cane is also one of a kind.