I don't think a cruise would be all that fun. I'm sure it would be sooooo super structured (like the 5* meet and greets were), that there would only be certain (short) amounts of time that they would even be accessable, and that time would be very organized. And then maybe they would do a concert, and that would probably be it. Its not like they'd be freely roaming around the boat at all times, and hanging out with us by the pool.
I'm glad that I can say that here...if I posted that on the NKOTB boards, I'd probably be ripped to shreads for being negative, and have my Blockhead card take away!