Most of the CA state parks are open south of SFO. The campgrounds require reservations. No hiker biker sites because that is considered group camping.
Here is my list of campgrounds SFO-SAN. If they are marked hiker-biker they also have reg camp sites. Military ones will req a DOD ID. First number is total miles from start. Second number is miles from preceding campground.
PACIFIC COAST ROUTE CAMPGROUNDS, HOSTEL, MILITARILY LODGING
000/000
Colma Bart station
026/026
Half Moon Bay State Beach
Hiker-Biker
048/022
Pigeon Point Light House
Hostel
083/035
New Brighton State Beach
Hiker-Biker
128/045
Navy Lodge Monterey
Military lodging
131/003
Monterey Veterans Memorial Park
Hiker-Biker
133/002
Navy Post Graduate School Monterey
Military-Lodging
136/003
IHG Army Hotel Monterey
Military-Lodging
169/033
Pfeiffer Big Sur State Park
Hiker-Biker
198/025
Kirk Creek Campground
Camping (no water or showers)
203/005
Plaskett Creek Campground
Camping (no showers)
238/035
Hearst San Simeon State Park
Hiker Biker
265/0027
Morro Bay State Park
Hiker-Biker
273/008
El Chorro Regional Park
Camping
275/002
Camp San Louis Obispo
Military-camping military-Lodging
293/018
Pismo State Beach/North Beach Campground
Camping
295/002
Coastal Dunes RV Park
Hiker-Biker
296/001
Oceano Campground
Camping
339/043
Vandenberg AFB
Military-Camping. Military-Lodging
381/042
Refugio State Beach
Hiker-Biker
384/003
EL Capitan State Beach
Hiker-Biker
416/032
Carpinteria State Beach
Hiker-Biker
439/023
McGrath State Beach
Hiker-Biker
448/009
Navy Lodge Port Hueneme
Military-Lodging
454/006
NAS Point Mugu
Military-Lodging. Military-Camping
456/002
Point Mugu State Park
Hiker-Biker
460/004
Leo Carrillo State Park
Hiker-Biker
487/0027
Hi Los Angels Santa Monica Hostel
Hostel
516/0029
Fort MacArthur
Military-Lodging
554/0038
Crystal Cove State Park
Camping
568/014
Doheny State Park
Hiker-Biker
595/027
Pendleton Pacific Views Lodge
Military-Lodging
611/016
San Elijah State Beach
Camping
637/026
SanDiego
Military-Lodging