If you can enter with a backpack with your things. I recommend you take a locker as soon as you enter to store it. Enjoy it!
They do not allow any type of food or drink to pass, because everything is sold in the park, there are security controls before entering as if you were going to travel from an airport, but I do not know how demanding they are, if they will let you pass some water or some snack, because I do not enter anything ok.
Yes. No problem
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