You’ll have to figure out for yourself just exactly where in Marin County this nude beach is, in this mostly-SFW photo from a while ago. The place was officially closed at the time due to an unsafe stairway and it’s more-than-likely officially closed at this time.
But actually, your nudist types like out-of-the-way places anyway, the kind that require long descents from the nearest road.
Now, your San Francisco Bay Guardian occupies the field of nude beach field scouting – their link appears to be down right now but feel free to give a try later on.
The nude types were to the east of the stairway and the never-nudes were to the west - it all worked out. All the while, a couple of fun fearless females felt free to parade up and down the whole beach by the low tide line, on the catwalk, they did their little turn on the catwalk, yeah on the catwalk, on the catwalk, yeah, they did a little turn on the catwalk for about half-hour:
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By the way, is there a special law that disallows photography on Public Nude Beaches? Not that I’m aware of.