In St. Lucia, I would recommend Cosol and his brother Yellowbird. They gave us a real taste of the island and I would book him again in a heartbeat. I have also heard good reports on Fabian and Frank - two other private guides. All three have websites if you Google for them.
April 1, 2006 - Serenade of the Seas - 7 days to the Southern Caribbean
October 8, 1984 - NCL Sunward II - 3 day cruise to the Bahamas