Upgrade One Park Ticket

[RSD Part Deux]

Can I buy a one park one day ticket - and then once I see I have enough time left in my day, upgrade that to a two park one day ticket at guest services?

 

[timeman]

I don't see why you wouldn't be able to. I know that you can upgrade any ticket to an Annual Pass, so I would think because the one day/two park pass costs a little more than the one park pass they would have no problem taking your money.