Check out this video on travelchannel.com: http://www.travelchannel.com/Video_&_Photos/Video_Detail?lineupId=1387565775&titleId=1387552814
There is a big haunted house there or somethign. Says one of the proprietors, "You don't really have to try to frighten people...you just bring them down into the bottom of the ship." Yeah, great idea, let's go down into the bowels of a ship and try to not get scared.
Crazy corners? Jutting edges? Weird doors? Sounds and smells that are unfamiliar? Check, check, check. Rumors of haunting, crazy lights? check, check.