We are sailing 7 days on the Fantasy in January stopping at Castaway, Tortola and St. Thomas. We will have our 11 month old in tow. I am fine with staying on the standard beach in Castaway and on the ship in one of these places, but would like to book an excursion on one of the Caribbean stops. Any recommendations on what to do with a 11 month old and 5 year old that isn't just ridiculously expensive? How do you handle transfers (thinking about car seats...)