When I looked at their website only certain ones are allowed. But you can always call them to find out if they are allowed.
From my experience, you can hide them in the bottom of your bag. Alternatively, you can leave them in your car, leave the park and re-enter. There is even a bench right by the entrance where you can sit and eat them if you wanted to. What i did with my wife was leave and ate at burger king (since we had coupons) and then returned. Its up to you if thats worth the effort. Have fun out there!
If the snacks are for your kids you can take them. Do not bring a lot because, you will have to take them back to your car, or throw them away.
There are People at the en trance Who Checa tour backpacks
Officially, no. Unofficially snacks can easily be hidden in towels, changes of clothes, etc.
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