A few recommendations:
Cape Lookout St Park - away from hwy 101, miles of beach to roam from campsite, cape hike, cute town of Oceanside nearby
Tillicum Beach Forest Service Campground- Ocean view from many sites, beach access
Floras Lake County Campground - seclusion, isolated beach walks, hike to Blacklock point,
Cape Blanco St Park - great views, lighthouse, secluded beach and forest trails