Tomorrow is San Francisco's annual Bike to Work Day and the only excuses to not join this year's festivities are being bikeless or jobless. Then again, even if you are jobless, grabbing some coffee and a bag from an SFBC energizer station is a great reason to wake up before noon, especially with weather as awesome as this. Several of the energizer stations will have bike doctors ready and willing to do some quick and basic maintenance on the bike you've had collecting dust in your hallway since last year's Bike to Work Day, and SFBC will provide valet parking downtown (Market & Battery, 8a-6p) for cyclists whose employers aren't bike-friendly. First timers unsure of how to get from home to work can find a nearby commuter convoy departure location and ride downtown with a group of fellow commuters. If you work in the South Bay, are in good riding shape, and like waking up at the crack of dawn, join SF2G's group ride from the city to various peninsula destinations. And, of course, there's the annual Bike Away from Work party and fashion show at Rickshaw Stop, free for SFBC members, even those who join at the door. If you're not convinced why you should ride at all, check out the Exploratorium's special section on the science of cycling.