Here is a question I have very similiar. Do they bridge the price. I bought a two day single park for two Saturday's for my niece because her ap is onto good on there Saturday's like mine is. The rest of the year hers will work when there on Saturday. Anyway. If she uses it at the gate, goes in and then we want to upgrade it, do they bridge the price like they do at WDW. So all I have to pay is the difference to add the park hopping on for the two days.