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An escalating row of Victorian houses -- aka
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An escalating row of Victorian houses -- aka the "Painted Ladies" -- on the edge of Alamo Square Park, overlooking the San Francisco skyline, starts off a Streets of San Francisco bike tour. (October 2011)(Credit: AP)

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San Francisco by bike

If you're reasonably fit, you can probably handle a tour from the likes of Streets of San Francisco Bike Tours. That group, which started in 2011, offers options ranging from 9 to 18 miles and a relaxed pace through the sights and sounds of the California city by the bay.