Question - if I do decide to upgrade my current 1day1park ticket to an AP when I get to the parks, will I have a problem at check-in if I do not have my AP at that time (if I added the DDP onto my current ressie)? I bought the ticket a couple of years ago, so I want to use it first then upgrade, so I can get the current price of admission credited toward it. BUT, I would be checking in first to the resort, THEN going to the park.