Massive playground in Golden Gate Park with tons of different play structures, a water/sand area and a great, albeit slightly dangerous concrete slide (use cardboards to slide).
Very nice playground near the Presidio. It has a water/sand structure as well.
Newish playground next to tennis courts and a baseball diamond. This playground also has an indoor area, which might be rented out for birthday parties on the weekends.
Big, new playground with some excellent slides. Padded floor throughout!
Must be one of the playgrounds with the best view in the world! Fairly new with a basketball court and a big lawn area. You can use the toilets at the nearby fire-station.
Massive playground in San Mateo with huge play structures. Right by the Bay.
Right along the Bay - gorgeous views and walking/running trails. Fairly newish playground with BBQ/picnic area.
