I would recommend you bring your own. I know for sure they do not rent them, and if they have them for purchase they will be expensive. We have always brought our own. There is no active life guard, and having your little ones in jackets gives you far more freedom and security for your kids in the water. The pond does have a shallow area roped off, but it's easy for kids to stray out of the area and the depth drops off quickly.
I don't believe I saw them, but they might have them in the gift shop area. Most people had their own from what I saw
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