For a city known for its openness, San Francisco sure keeps its secrets. Savvy locals often miss the nearly 70 hidden mini-parks in privately owned public spaces… if you’ve got energy to burn, steal some cardboard …and cruise down the concealed Seward Street Slides  …stand in awe of the multicolored and multiethnic art in the Mission’s slender alleyways …trust us, digging into the city’s free gems definitely pays off. (San Francisco Travel)

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