can I upgrade an undercover tourist 2 day w/1 free day ticket to an AP before I leave the park on my 3rd day? What "value" do I get? Exactly what I paid ($263)? Or the gate price of a 3 day ticket? Also, is the gate price of an AP different from the online price? I would be getting the pass without blackout dates, but not the premium one. It's $349 + tax online.