Oh, sure! But not sure what you mean by "secluded"...And remember the water here is COLD! and the sun does not always shine warmly, so your images of Hawaii or Southern California aren't accurate!
But some of our family favorites are:
San Francisco: Baker Beach (just outside the Golden Gate, good for skimboarding, alway some nude guys at the east end), Ocean Beach (surfing), and Crissy Field and Aquatic Park (latter two NOT secluded, but lovely urban beaches, in fantastic location, fabulous views and good people watching, windsurfers, kitesurfers).
Marin County (south to north): Kirby Cove (secluded, rocky, hike down to it, just outside the Golden Gate (faces Baker Beach, see above), Tennesssee Cove (hike a couple miles to it, and on nearby headlands. Not sure if I've ever seen anyone in the water there), Muir Beach (sandy, hippie beach in the old days, good hikes nearby, campfires allowed), Fort Chronkite (sandy, surfers, skimboarders, lots of dogs, carnelians, nice hikes on nearby headlands, good views on clear days of the Farallone Islands on the horizon), Stinson Beach (the beach most like s.Calif--lifeguards, snack shack, sandy, surfers. We usually have Thanksgiving on grass nearby with tables and BBQ), Bolinas (more counter-culture than Stinson, sandy beach, surfers).
And if you're really looking for SECLUDED, one that you need to hike to is Keller Beach in the Point Reyes National Seashore, a couple miles north of Arch Rock-which is a couple of miles from the parking lot. And Limantour, which is a really long sandspit, with lovely dunes. Dangerous surf, but if you walk a ways, you'll be completely alone. And there are some really long wild walking beaches further out on Point Reyes. But beware the surf. Tragic accidents have taken place there.
Hope that helps!
Robin about 8 years ago