It is a free activity at TL to do. I have never seen anyone with their own gear, so I don't know if you can bring your own. Really, you are only in the water for 5 minutes or so, since they make you swim from one end to the other so that others can go in the water. They basically want to keep a flow of people going. The area is not very large so there are only about 20 people in the water at any point in time