Down Horsfall Road off of 101 are OHV camps and trails, equestrian camps and trails, day use areas, and general use camps and trails. Wild Mare Camp - set up for camping with horses - was empty and very, very nice, but the mosquitoes were just brutal, so I moved to the OHV camping at the coast, where the breeze keeps the little buggers moving. Very pleasant here. Just a parking lot with large camping-only RV sized slots on three sides and parking for the beach on the side next to the ocean. I've stayed here three times now, and there's always a few OHV folks. Their pleasantness or rudeness and the amount of general hubbub varies greatly. The general rules is that the warmer and nicer it is, the more constant and unending and annoying will be the sound of unmuffled small engines.
Nice clean bathroom, no shower, near 101 but quiet, 20 yards out of the campground you're in the sand dunes