Yes
Yes, you can buy tickets after purchasing parking garage entry for your vehicle, or at the park entrance if you're on foot. Space in the park is limited and is first come first serve, although you can pre-reserve cabanas, etc.
Yes, you can buy tickets at the door. However, searching online for tickets may (or may not) get you a better deal in some occasions. Worth checking out.
How early do you need to be there to get tickets?
Yes you can
But get there early,beacuse the entrance is very limited
Yes you can buy tickets when you went to the park$80 for the day
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