We'll be going on the all day excursion to the Baths with Disney. What should be bring with us vs what will Disney- if anything beyond transportation, a tour, and lunch- provide? Do we need a dry bag to keep things dry while exploring the caves? Snorkeling gear? Towels? Etc. Assuming we'll bring passports, key the the world cards, sunblock, sunglasses, a change of clothes (left on the bus?), cash for Poor Man's Bar, bug spray (needed?), etc. Anything else to consider?