Started traveling to the BVI with a 2 year old who is now 6 (and been there 5 times, her 6th this November). Pretty much agree with most of the posts, while underway pfd and jack line of some sort, on a ball or at the beach constant supervision. For activities bunch of coloring books, play-doh, swim toys and kids movies (on an iPad for ashore and raspberry pi and thumbdrive to hook to onboard tvs). Must say with all of that (lugging around a bunch of extra stuff), I wouldnt change it for anything, daughter loves the beach and the ocean and we love being able to share something so special with her.