Currently, the vacation package offer out there for the general public is buy 4, get 3 in regards to rooms and tickets. You must buy at least a one-day base ticket with your room and book a room for at least 5 days. It's been out there since November and you must book by January 24th. It's for stays from now until check-ins of June 27. All based on availability, of course.
It's book 5 days: pay for 4, get 1 free
book 6 days: pay for 4, get 2 free
book 7 days: pay for 4, get 3 free
book 8 days: pay for 5, get 3 free
book 9 days: pay for 6, get 3 free
book 10 days: pay for 7, get 3 free