We went to the falls when staying at a resort in Jamaica and it is kind of like a park. You can go in and walk through stuff and there are spots for taking pictures. You can also climb out on just a couple of rocks to feel the rushing water or to get pics without climbing all the way up the falls.
One thing worth mentioning is that there are "vendors" selling stuff and they really hound you on the way in and the way out of the long entrance to the falls.
I was glad that we got to do this experience, but I am not sure if I would do it again. If you get the chance go to Tajma Hall they sell just about anything that you could want for pretty cheap ya just have to haggle a bit.