There are many areas thought the park to sure and eat. I believe you can bring food into the park, but it is an amusement park and not a picnic ground so there are no grilling facilities.
I didn't see anywhere in the hershey store, but maybe in the amusment park area.
I went recently, and you can bring one bottle of closed, bottled water into the park, I dont think you can being food. At least our group couldn't.
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