Even with our 40' motorhome we've just driven up to the state parks along the coast and have gotten a site without reservations. Folks cancel daily. There are a couple nice forest service campground around Florence but can't recall the names at the moment - a much-photographed lighthouse (at which we gave tours). We've been at Cape Blanco often and rarely saw it full. It's one of our favorites - nice and quiet, not a congested area, beautiful beach and lovely lighthouse.
Pull in early morning and you'll find sites.
