The hike is a bit taxing, but as long as you take your time and wear good hiking shoes with grip, you'll be fine. As it hadn't rained much before our visit, the falls weren't gushing, but they were flowing enough for us to really enjoy the visit. The hike is on private property, it seems, so it's not traveled by many. We were one of two families back there so it was like a private get away.
Our private tour guide of Awapuhi Adventures swam out into the (very chilly) water and helped our kids jump off the cliffs into the deep water. They loved it! 7 and 9 years old and cliff jumping in Maui ... what a thrill for all of us! We could've sat back there for hours and just enjoyed the serenity. It was wonderful!