At&t/cricket also now work fine in this area of coast!! Yes, you can come in and hope for first come campsite (d loop year round, a &b loops opening this month). You can check availability and reserve online through reserve America website. Link from state park website.
Verizon phone service works great
Pets are allowed on all sites, but only limited cabins and yurts
The deluxe cabins don't accept pets. Also phone reception with T-Mobile is non-existent.
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