No Wal-Marts in that area.
Jeff,I used to keep my boat in the Berkeley Marina, and know the area intimately. Forget the Wal-Marts...there are none in that area. I don't know if I should let this secret out...it may ruin a good thing. Try the Berkeley Marina. As you drive into the marina, the road branches to the left and right. There is a sign at the fork in the road that says, "Camping Prohibited." Take the left branch and continue. To your left, you will see a fenced-off area for wind surfers (I used to windsurf there). To your right will be a parking lot surrounded by trees. That would be the best area for parking at night, just don't turn it into a gypsy camp and have the cops kick you out. Remain low-key. I suspect that the cops won't enforce the no camping rule as long as you don't rub it into their face that you're breaking the rules. Suggest that you leave prior to 7:00 am before the Harbor Master arrives at her office at the end of the parking lot.I stayed there for 2 months in my motorhome, arriving after 7:00 pm, and departing prior to 6:00 am. Yeah, I had it down to a science. Of course the local beat cop knew I also had a boat there, but there are many others who seemed not to have any connection with boating also parked there. The second best place to park is on the water side of that wind surfer area. There always seemed to be at least a couple of non-boaters camped there. Also, the Berkeley Marina is a safe place at night. No crazy people around, as with other local areas.The next Marina to the south, by a couple of miles, is the Emerville Marina. Don't even think of parking there at night! You are almost guaranteed a citation by the Emerville police if you don't leave when ordered! That order often comes at 2:00 am with orders shouted-out via the patrol car's loudspeaker. To my knowledge, there is only one campground available. It's at the north side of the 3M ball park in South San Francisco. Price: $49 a night at a regular parking space with no hookups! Then you'd also have to fight the traffic to get back across the Bay Bridge. Hope this information helped.