Overlooking Candlestick Park, this park has great panoramic views of the bay, however it's not one of San Francisco's better maintained parks.
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Right on the Bay is this actually very nice and undervisited park. It's very green, actually has functioning benches and BBQ pits, and a small fishing pier. You are also likely to spot windsurfers who come to this windy spot on the Bay.
A wooden structure built in 1888 and now used as a community meeting center.
If you are feeling adventurous, try visiting the abandoned shipyard at Hunter's Point.
At 317 acres (128 hectares), this is the second largest park in San Francisco, and is located smack dab in Visitacion Valley. It has been cleaned up, but this park is still under used. With rolling hills and views galore, this is the best place in the city to get away from it. If you have a dog, bring it to the reservoir on Shelley Drive where there is a large off-leash area where your pet can romp in the fields or swim in the water. There is an amphitheater, a duck pond, multiple playgrounds, some great hiking trails, and a few tennis courts.
Historic brewery, built in 1870, now used as a private residence.
Concerts, ice shows and the Grand National Rodeo (Owned by the City and County of San Francisco, but on the Daly City side of Geneva Avenue).