Akaka Falls on the big island was one of my favorite things to see. They have several different trails you can take but all of them lead to the falls. We took the shortest trail as they can go for miles and miles. The one that we took was paved in spots so it made for an easy hike to the falls.
The landscape was so lush and vibrant it made for great sightseeing as we walked through the jungle to get to the falls.