My boyfriend and I went on our first cruise last year, and we bought a BUNCH of books beforehand, and planned our own things to do. We compared the prices of excursions to the prices offered in the books if you choose to do it yourself, and they are WAY cheaper. We went to the Butterfly Farm in St. Maarten, and it cost us only like, $5...the boat wanted $30. We leave for Cozumel, Georgetown Grand Cayman, and Aruba on April 29th, and we bought another book, and have our book from last year, and we're ready to do things on our own again.