We are cruising W. Caribbean on RCC in June doing a stingray encounter, dolphin encounter, turtle farm and tiki beach in Grand Cayman. My question involves our personal belongings. Obviously we'll only take what we NEED...but with a 3 & 5 yr old...that's at least a backpack...and I'm guessing we need our passports when we get off the ship? and money....so when we're IN the water doing our "encounters." are there lockers we can rent and lock? Someone said they are just open cubbies...doesn't sound very secure. Should I worry? Anyone have any advice on this? Thanks!