Drive up SR1 to Fort Bragg! There's lots of stuff going on there this weekend -- see their website -- just run a search on your home page for Fort Bragg California and it will grab it for you.

Call the Surf Motel at 1-800-339-5361. They have rooms left (a few, anyway) for $50-$60 plus tax. Very nice lady.

Fort Bragg is perfect for the parameters you specified. Tell them Uncle Bob sent you.

(But what is it about SFO that you have to get away from after just three weeks? I'd be as happy as a hog in a mud puddle if I was there!)