My kids, 7 and 9 felt so comfortable in their clubs that they decided to stay on board while we went to St. Thomas. And we felt comfortable leaving them - in fact, we got back and they still didn't want to leave. Of course, my guys are a bit older but they are good about keeping track of everyone, going over the rules. Are you worried about the actual activities or whether they're being supervised well? Check out a Navigator online to see the various activities.