I know it would cost more, but if you can get park hopper tickets, you can do a lot of both of those parks in 1 day. Animal Kingdom is open early and if you get there early you can get msot of the rides that you would want to do by mid-day. You can then head over to Hollywood Studios which is open later and can probably get on everything there too.
The fast passes for Tower or Terror and Rock n Roller Coaster will likely be gone unless you reserve them ahead of time.
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