Be sure to ask for the Owners Suite. They are a big improvement over those small standard suites. The perks and service is a notch higher and you basically get first choice at everthing. You never have to stand in a line or not have a seat.
Of course, since this is a Carnival thread one will not find Owners Suites on the deck plans. Cat 11 or 12 suites only - several of each category - and nothing special other than priority embarkation/debarkation.