Sometimes you can book another cruise at a reduced
DVC point rate - I haven't done this myself but have heard others doing it.
There is a DVC party on the 7 night cruise and win prizes (DVC merchandise).
After your first
Disney cruise you belong to the
Castaway Club - get a free gift and pin in your stateroom, a nice reception with the Captain and other ship's officers.
Happy sailing!
Rae