I want to confess something at the outset: I like cruises. Sometimes I like to lie back in the sun, eat to excess, enjoy the ocean breezes, and not have to think much about what I’m going to be doing for the next week. I unpack and wait to be taken to the next adventure. But that’s not the vacation experience that everyone prefers. I know plenty of people who wouldn’t be caught dead at a crowded pool or standing in line for a buffet or buying a …