We are first time cruisers going out on the Wonder on October 4th, 2007! We've made ressies for some of the excursions - Glass bottom boat at Nassau, Parasailing, bikes & tubes at Castaway Cay. My question is - what type of bag do you carry off the ship with you? Is it waterproof? While we are parasailing or tubing at Castaway Cay - are there lockers to put our passports & cameras in or what do I do with these things when we are in the water? Thank you!!