I'll second the KOA in Petaluma especially if you have kids. I think there were 2 or 3 thousand kids there when we stayed there last summer for a week.:E Almost exactly a year ago actually. It's not that bad to get into the City from there but I can't imagine pulling our 5th wheel through San Francisco. Many years ago I got on a wrong road trying to bypass the City in our old C class towing a motorcycle trailer. That was almost a huge disaster. The Petaluma KOA is probably one of the largest KOA's I've ever been to but I will avoid it in the future because it is so noisy and busy. If you have kids great, if you will only be there for the nights, you should also be fine.