i was on a sailing cruise once and the on-board lounge piano player
had to put up with this troublesome passenger every night who
wanted to play guitar and sing, cutting into his time. It was
me...i found they had (an old beat-up) guitar on board and I
got people doing sing-alongs with me....but i might have gotten
old if i HAD to do it! the cruise line was Star Clippers, a
smaller ship which was a sailing vessel. Not the huge diesel
vessels which hold thousands of passengers..and dump poop in
the ocean, this one had a couple hundred guests on board,
and perhaps a hundred staff and crew.