Bring your own towel
They do not provide towels. They have some for sale inside but they are expensive.
Bring your own
Take Your Own Towels !!
You can bring a beach bag for towels and clothes and stuff, just no outside food or drink allowed in. I put my stuff in my bag on a beach chair there and nobody touched it while I was off doing things. They have lockers available if you have keys to the batmobile to lock up while you float down the lazy river.
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