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.
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)
Streets of San Francisco Bike Tours guide and co-founder Eoin Canny explains the history of mural art in the Mission District during a tour in San Francisco. (October 2011)
Paula Froke of New York rides along the Embarcadero in San Francisco during a Streets of San Francisco bike tour. (October 2011)
The Ferry Building, on the Embarcadero at the foot of Market Street in San Francisco, as seen on a Streets of San Francisco bike tour. Inside is the Ferry Building Marketplace, with a wide selection of food vendors, cafes and shops. (October 2011)
The "Cupid's Span" sculpture sits across from the Ferry Building along the Embarcadero in San Francisco, which provides the backdrop for a picnic lunch during a Streets of San Francisco bike tour. (October 2011)
Point Reyes National Seashore in Marin County, Calif., north of San Francisco, is part of a series of bicycle excursions in Northern California. This part of the tour includes a hiking and mountain bike jaunt along some of the park's many trails. (October 2011)
Visitors check out both wine and cycling memorabilia during a stop at Velo Vino Napa Valley in St. Helena, Calif., founded by the family that makes Clif Bars and Clif Family wines. Velo Vino offers wine tastings and wines and speciality foods for sale, as well as bike tours and cycling events. (October 2011)