Cruisin'?

I've always wanted to go on some cruises. Well, kind of anyway. See, I have a problem. I don't like deep water. Water that I can stand up in that is below my head is fine. Water that is over my head is not cool. Sadly, cruises don't occur in my bathtub. I suppose I could go on a cruise and just lock myself in my cabin or stay in all of the indoor areas but I don't know how much fun that would be. It seems like a waste of money to do things that I can do cheaper on shore.