This is a longer hike. At about 4 miles round trip it will take 2 1/2 to 3 hours, but is well worth the time spent The beginning of the hike is the hardest part if you are out of shape (as I am). You are walking up steps that alternate between rocks and dirt/tree roots for about 1/2 mile. Once you reach the cane field it gets easier, and the rest of the hike is less vertical. All along this part of the hike there are many small falls and pools to view if you look off to the right of the trail or step off the trail a bit. There is also a large banyan tree you walk right under, although not as large as the one in Lahaina.
Later in the hike the trail goes through a bamboo forest. Approaching the forest you get the view of it up the side of Haleakala, and it looks like a scene from a movie. Inside the forest, when the wind blows the bamboo claps together and makes the neatest sound. Much of the forest is a wood plank trail, which is good because otherwise it would be a very muddy walk. The planks are still slippery though, so be careful.
The section after the bamboo forest is the toughest to negotiate. You are walking along the slippery rocks and crossing the stream in several places. It's possible to do this without getting wet, but difficult. Definitely don't want to wear a pair of shoes that you care about, but do wear shoes . . . sandals or flip flops would not be a good idea on this hike. A hiking stick, either one you brought with you, or a bamboo pole you might find along the side of the trail, is very helpful.
The end of the hike is the big payoff . . . you are at the bottom of the 400 foot high Waimoku Falls. They are just beautiful, and you can get as close as you want to them. Standing under the falls is not advised, noting all the big rocks around the base of the falls and thinking about exactly how those rocks got there. It's gorgeous, but please be cautious!
This hike was one of the highlights of our trip to Maui and is highly recommended if you are physically able to do it. It costs $10 to get into the park, but since it is the same national park as the Haleakala Crater, you can see both if you visit them within 3 days and save your receipt.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.