We are going on the Fantasy in April with stops at Costa Maya, Cozumel, and Grand Caymans. We are a family of 4 with 2 DS ages 12 and 15. We will also be traveling with another family with close ages as ours and my in-laws. My question as we have only been on an Eastern cruise and this will be our first Western, what would be some things we should look at doing. My DW likes some shopping but mainly we love spending time on the beach and the water. I was looking at all of the shore excursions and wanted some input as to what I should be looking at with some of your experiences....Thanks for the help!!!