You can do both parks with a one day park to park ticket.
You can buy the 2 park ticket (park to park is best to use the train). If you get the express passes (also available for both parks) you can ride every ride in both parks within a few hours if you go back to back. But I'd suggest one park per day for the best experience.
There is two ... studios and adventure... but is needs 2 days
If you buy a multiple entry ticket, you can. And of course needs atleast 2 days to see all it has to offer !!
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