AP rates are Annual Pass rates. You need to have an activated annual pass upon check in to get the discounts. I know there is a toll free # to call for ressies or you can use CRO's # as well. I believe if you know what the code is (and they are available!), there is a place on the on-line reservations to place the code.
Go to mousesavers and you can see all of the discount rates available (including AP) and the codes you need to use to get them.
You don't actually have to have the pass to book the rate, but you do have to have the pass (or your voucher for the pass) at check-in or your rate will be rack rate. Also, keep in mind that only one person on the reservation has to have the AP to get the AP rate.
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