The art appreciation stop: For this stop, lock your bike at the racks at Valencia at 16th Street and head over to ArtZone 461 (between 16th and 15th streets). This friendly gallery usually features local artists and always has something interesting. Across the street, you can appreciate the art of motorcycle maintenance at Munroe Motors, one the oldest motorcycle dealerships in San Francisco, in case you're looking to trade your Schwinn for a Moto Guzzi. If you prefer the art of fine haberdashery, pop in next door at ADS-Hats. You'll find shelves filled with styles as diverse as Edwardian top hats and elaborate confections that would impress even Aretha Franklin. Finish up by appreciating the art of a perfect cup of coffee at Four Barrel Coffee (between 15th and 14th streets). Maybe it's that all the music you hear is being played on vinyl, or that the baristas' faces are depicted on the cups, but this airy, open-beamed coffeehouse with the roastery in the back is one of the best spots in the city to get your caffeine fix.