This year we're considering two November cruises from San Juan: 7 days on the Connie or 5 on the Radisson Diamond. The ports are St. Thomas for both cruises, plus St. Barts, St. Kitts and St. Maartin for the Diamond and Casa de Campo, Grenada, Antigua, and Barbados for the Diamond.
Our problem is that we can't picture what we'd do in any of the ports: none of the ports sounds as interesting as the ports on the Horizon trip. If you don't sun, snorkle or gamble, is the trip worth doing? Also, are 5 days on the Diamond worth a cost that's more than for 7 days on the Connie?
This is an active board, so we suspect you'll have some interesting views on these subjects.