I had a nursing conference on a cruise ship a few years ago. It was a small conference group, only about 30 people. I didn't get to go because the day the ship left port, Gary was having emergency open heart surgery. But all my friends who went said they had a great time.
I think a 4WT cruise would be a great idea! I said I wouldn't go on another cruise, but I would with my 4WT buds!