Great for you! Better start packing!
As Dave says the Triumph has some flow issues as not all decks go forward to aft. So if you need to go the the main dinning room in the back you end up going up and down to get around the middle of the ship which is blocked. Once you are used to that fact its not a problem. Check the map on the ship and find out which floors allow you to walk all the way to the back and you can get around fine.
Have a great "surprise" cruise!
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007