I was wondering what people do with thier valuables while they are on excursions. We have a snorkeling adventure planned for Nassau. I assume we need to bring our passports. I'll want my camera, cash, etc. Where do I put these things while I'm gasping for air trying not to suck water in my snorkel??? Do they have lockers on the excursions? Would that be safe? I have looked a bit at the water proof pouches....is this what people do? Do you keep it all on your person?