Well, that really depends.
You'll get priority boarding to start with. Most likley you'll have use of the Concierge services onboard, who'll make restaurant reservations for you, and try and fill any special requests.
You'll also most likely be granted access to some of the "suite amenities", like breakfasts held for suite guests in the steak house, and a couple of cocktail party invitations. Perhaps you'll be invited to dine with the Captain or some of the officers, and likely an invitation to the bridge.
If you receive some of all of the above, plus a few extras... well, it depends