I'm going to WDW in May (yay!). I bought a package through Disney that includes a 2-day non-hopper ticket. My plan was 1 day at Epcot and 1 day at AK. Now that the park hours have been extended, I'm thinking of adding park hopper and going to MK after AK (and maybe HS after Epcot?). At what point in my trip is it too late to do that? What if I add it but reservations are "sold out" and I can't get into a second park? If I do add it, and can go to HS after Epcot, could I get back into Epcot (closing at 10pm, HS closing at 8pm) with my initial park pass, or would it be dependent on current availability?