Along with what Rich said, the SF Zoo is awesome, as is Golden Gate Park. The Park has all kinds of cool stuff to do and see...Academy of Sciences, Conservatory of Flowers, etc. You can rent segways to take through the park. Another cool thing to do is rent a scooter/car type thing for a GPS self tour of the city. My brother did it once and said it was really fun.
http://www.golden-gate-park.com/
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