Actually, there are some other officially nude beaches in the US. Here's the ones I could find:

Rooster Rock State Park in Oregon, which claims to be the first official nude beach in the US. I think there is one other in Oregon.

Hippie Hollow near Austin, Texas. Amazing that this has survived in such an extreme red state.

Mazo Beach in Wisconsin. This one is endangered.

These are ones that are officially sanctioned. Yes, there are a few other places where there is an (often unwritten) agreement and you do take a risk, though I would suggest that there is safety in numbers.