We are looking to book a Western Caribbean cruise for January of 2007. We would like to try RCCL this time and need to choose between Navigator, Voyager, Explorer, and Freedom. All have the same itinerary except Explorer has Belize and Costa Maya instead of Labadee and Ocho Rios. There will be from 3 to 5 couples (2 couples aren't sure yet), we are all in our early to mid 50's. Any advise would be appreciated. Thanks.