These are not easy to get to and you have to drive along a very narrow gravel road to gain access to these falls, but it is well worth your time.
I camped at Fall Creek Falls and drove the 25 miles over to Rock Island. The scenic beauty of this wooded park is dominated by the Great Falls of the Caney Fork River - an imposing limestone gorge. The Collins and Caney Fork River are dammed for power generation. The layered rock that forms the reservoir has leaks between the rock layers. The cracks are large enough to allow a tremendous amount of water to come through creating a magnificent waterfall. At the bottom, a large wave forms from the water flow that kayakers call one of the best "surfing" waves in the country (a dangerous Class 4 rapid).
Rock Island has 60 campsites, each equipped with electrical and water hookups, grill, and picnic table. Three modern bathhouses (with hot water showers, lavatories, and commodes) are located in the camping area. There is a dump station at the far end of the campground for the convenience of self-contained camping rigs. I drove through the campsites here and was not impressed with them. The sites were close together and there wasn't much understory for privacy. They have a tent campground, but it was closed when I drove through.