
The Queen Mary is larger than the Titanic. She's so big that when you look down her corridors, you can see the how the deck is curved downward from bow to midship and back up again to the stern. She has several restaurants and bars onboard, and hosts a massive Sunday Brunch in the grand ballroom that I believe is the single largest room ever built inside a ship. There's also an onboard shopping mall, a large museum below decks, and a "Ghost Ship" tour that takes groups to some of the haunted locations and recreates spectral visits with special effects.
http://www.gettysburgghosts.net/queenmary.htm
Every Halloween, The Queen Mary hosts a bash called the Shipwreck Halloween Terror Fest. This year will be the 13th Annual Shipwreck. One of these years, I hope to make it to the party.
http://www.queenmaryshipwreck.com/shipwreck2007.html