I saw someone doing it. Dont recall any signs saying you can't. I'd say go for it and beg for forgiveness later. But i doubt it's a problem.
I haven't seen anyone doing it while I was there but I don't see why you couldn't. I've seen people doing it in Ocean City and Wildwood.
I don't think there's a metal detect
Hmmm.. you might want to call the Nj state park on that question
I don't know about this
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