In Feb 2013 my family took for the first time a 7-day cruise to the Southern Caribbean to visit Puerto Rico, St. Croix, St. Maarten, Antigua, St. Lucia and Barbados. The Caribbean Sea was calm and you could barely feel the boat moving; although we were concerned about motion sickness we were fine.
Embarkation and disembarkation went smooth and organized. The ship had ~3000 passengers (80% from US, rest from Canada,Puerto Rico, Europe) with a good mix of ~60% retired people,~40% of them younger with families. We found the itinerary, boat and its amenities (restaurants, Promenade, theater, sport facilities, pools), staff, room and food excellent. The entertainment was very good especially the Ice Show (but the 70's show & disco-we could skip. The Cruise Director was everywhere where entertainment was offered, we taught that was too much).
The excursions are a bit pricey, we took our child to swim with the dolphins in Anguilla (from St.Maarten),an amazing and unforgettable experience. I personally do not recommend shopping in ports, you can get the same deal in US outlet malls or department stores and you know that what you pay for is authentic, has warranty and can be returned. I would have liked if among the shore excursions would have been a shuttle to a beach offered, nothing fancy just an organized and safe transportation to a nice beach. This would be a good idea in order to avoid the hassle, harassment and price negotiation with the taxi drivers or unsafe public buses(avoid them, unreliable, we saw a driver drinking beer).