At many other parks, this would be an upcharge extra, but it's included (or was included, when it still existed) in your admission. This is cold water (to be temperate for the sharks), so it's not for the faint of heart. You are given a snorkel and mask and instructed to keep swimming forward at all times and not meander. The sharks are not big, and certainly not dangerous, but it is still really cool. It's essentially Disneyfied snorkeling with real marine life, inside a water park.