We a departing for Oregon today for a family reunion a little south of Portland. We decided the Friday after noon we would like to head to the coast for a few days (northern part of the coast). Ever...
You might want to check the Warrenton/Astoria/Seaside KOA. It's a large park and it's generally the one place I can get in on short notice if all else is full. You can go to their website and see what types of spaces are available and book online. I just looked and they do have openings this weekend.