Cell service very suspect. I took why work phone which is Verizon and I had 0 bars. My personal phone at&t had 1 bar but the call dropped instantly. Moto of the story is, cell service out there sucks.
It's sketchy. The best you get is maybe 2 bars. Go just outside the shower facility just past the park entrance check in booth and you get some service. You might also get it at the entrance to the park off the main highway.
I ended up checking it out with my ATT phone and couldn't find service anywhere. I spoke with one of the staff members and they said the best place to get service with ATT is near the playground or Pavillion but no luck on my end.
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