Brian, It is Ocala, Fl. Search Silver Springs, Silver Glen State Park. They still have the glass bottom boats touring the Spring and river. It is where they filmed the old black and white Tarzan Movies, Sea Hunt and Movies like the Monster From the Black Lagoon. There is still monkeys in the trees.
Entry to the Park for the Knap In is free along with parking. There is a small fee to get into the knap in. There is an excellent museum on site with a lot of Florida points, including the famous "Big Red" in Overstreet's book.