Can you rent snorkling vests on St John trunk bay beach?

[mommyinmd]

In all my planning, I forgot about getting snorkling vests for the kids. we all snorkled 2 y.o. on the Magic at Castaway Cay. They of course supplied the vests there. I'm wondering if I should purchase the vests or rent them at the beach [if you can]for St John. How about adults too- do you really need a vest? Thanks