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You could always visit Alcatraz Island... it was an infamous prison not so very long ago and has been used in various movies, such as "The Rock" with Nick Cage and Sean Connery.
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Well, I don't live in San Fransisco, but if you drive across the Golden Gate Bridge, all you have to do is follow the signs and you will get to the redwoods. They are hard to miss!!

If you are going to San Francisco - be sure to check out the Redwood Forest! It is one of the most beautiful places in nature. The trees are gigantic, big enough to drive through. The last time...