You can buy the tickets online then go directly to the entrance of the park you choose.
Depends on how many people, what day, if you live in SoCal, and if youre doing one park or both, and how many days. You should call because they do deals.
Downtown Disney no charge two hour free parking with validation you get your parking ticket stamped with purchases.
It depends on how many people you are taking with you. A 2 day park hopper ticket for two adults will be about $520
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