My wife and I are going with her entire family to the Caribbean in June on a Royal Carribbean Cruise. There will be 6 of us who want to dive. I know that one stop is Coz, and another is Grand Cayman. Are there any suggestions about whether we should try to get a local dive op to take all of us as a single group or should we use the cruise lines shore excursions? I am afraid of overcrowded dive boats. Any advice would be great.