i have the AAA membership.
it is valid for 10% discount in the parks for food and merch. discounts for purchase of park tickets but best if you buy them direct from AAA.
many places in city walk also honor that card for the discount.
if you don't see the AAA symbol in the front window at city walk, ask them if they honor that discount card.
you can get up to 35% discount for the onsite hotels.
with AAA, you get free roadside assistance, help with locking yourself out of your car, galleon of gas, towing to the nearest mechanic, discounts for on line shopping at stores, discounts on hotels throughout the united states, etc.