Hi,
Most cruise ships sailing to the eastern Caribbean on 7-day itineraries embark from Florida. Ports of call on an Eastern Caribbean itinerary often include the Bahamas, St. Thomas, St. John (USVI), Puerto Rico, and perhaps St. Maarten/St. Martin. If you want less sailing (i.e. time at sea) and more shopping and opportunities to go to fantastic beaches, then an Eastern Caribbean itinerary might appeal more to you. The islands are relatively close together, smaller, and shore excursions tend to be more geared to beach or water activities.