Yes you just need to tell them you have an allergy and they are very accommodating. Just be patient as it will take time for them to comply with the necessary precautions.
Hershey park is cognizant of those with allergies. You just have to ask and tell them. There are things at Chocolate World where you buy tickets - like make your chocolate bar - where there are options to add nuts so make sure to check on how they would handle it for you.
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