Yes--deck 5 is the promeade deck and you can walk from one end to the other. It's a good location to fine any other deck from. Was on her June 05 to the Bahamas and had a blast.
Karen
There's no deck (other than the track, which is quite small) that does a complete loop of the ship. The Promenade Deck (3) has a deck on either side that's a great spot and does go down both sides of the ship, but does not loop.