Hmmmm ... your entry/day fee at DC includes mask and snorkel. IME every snorkel was 'new' and you keep yours when you depart. Use of personal mask and snorkel is allowed (see FAQ: Discovery Cove provides a mask and snorkel, towels and beach chairs. Guests may use their own masks and snorkels, if they prefer, but may not bring any other diving or swimming equipment into the park.). No fins . . . I don't recall ever seeing a place to buy equipment - but I wasn't looking for it either. Don't see on the map .... maybe some stuff in the gift shop?