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There is a sign about a mile or so inside the gate that says "Game Preserve No Firearms or Hunting Permitted", I've always taken that to mean long guns.

As far as rattlers, I've been down many of the trails many times and have never seen one, but that doesn't mean they are not there and I always try to be on the lookout. I did come across one once within the park while working (surveying), but I was a long way from a trail.