You can keep them in your car, exit the park and eat them, and re-enter with no problem.
You can leave your food in the car and go out of the park to eat it. Re-entry is allowed.
We brought our own cooler and ate lunch at the car. The park isnt huge by anymeans...from the farthest corner to the lot is probably 5mins.
Because they sell the food and snacks at the really "reasonal" prices ...
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