We tried to do the same for our coming trip to POR May 22-30, 2007. We have a AAA package w/dining and wanted to add a room only to the beginning or at the end but unfortunately there were NO rooms avail. (we need Alligator Bayou b/c there are 5 of us) NO AAA, NO AP and NO rack rate even! The only option we were given was to switch to a different resort that had openings. We decided against that and will probably just stay at SOG our drive in night so we can get to the parks early when our package starts the next day.
Last year we stayed a POR at the same time and about three days before our check out we decided we "needed" one more day so my DH tried to get a room. Nothing was avail. so for the next couple of days he checked with the front desk every time we came back to the resort. Finally on the last day they said we could have a room - don't know if someone cancelled or if they just got sick of him begging but either way we got a room!
and we were able to keep our existing room (at rack rate of course!) So maybe if you don't get something before you leave for your trip, there may be something open up while you're there.
Also, we checked with our AAA agent about turning in our 10-day Park hoppers for APs when we go this coming May (we may try to get in one more trip this year
) She told us we could but that we would need to do this on our first day so that we would get full credit ($ amount) for the tickets. From what I've read on this site and others though, that isn't the case - my understanding is that we can do it at any point during our stay as long as there is at least one unexpired day on the park hoppers.
Have a wonderful trip in May - maybe we'll see you there! If you see a guy hanging out in the lobby trying to get an extra night it will probably be my husband