I believe the CAA discount only applies to the room portion of your package and it can be anywhere from 10-20% depending on the season.
Also something to keep in mind...only a certain number of rooms are blocked off for a CAA discount, so once those rooms are all sold, you would most likely be quoted the rack rate for your stay.
just for your info, you don't need to buy the full CAA pkg, you can get an al a carte membership which is all services but NO auto, and it is around $35.
Worth it, to get the discount. i think i saved about $350 for 6 day trip.