To cap off the city's annual Bike to Work Day, the San Francisco Bike Coalition hosts a congratulatory celebration for everyone who commuted using two wheels today. Along with tunes and frosty drinks from the bar, the party offers a chance to cool your heels (or massage your calf muscles) and trade choice bike routes and secret shortcuts before you pedal homeward. Merchant friends of SFBC (Timbuk2 and Rickshaw Bagworks, for example) provide goodies for tonight's raffle. And of course, there's plenty of valet parking available for your ride.