If your dates and hotel choice are set, I would suggest making the reservation with the AAA discount now. Then, if/when discounts come out in a few months, you can compare them to what you have.
There may be General Public discounts available, or as Master Yoda said above, there might be AP discounts. It might be worth one adult in your group buying an AP just to get the rate, especially at Polynesian prices. Some people save many hundreds of dollars with an AP discount.
-Rob
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