Don't feel like you need to ditch your car. The overall goal is participation. Don't feel bad if you can't ride all seven days, but don't give up after only one. Take small steps towards enjoying riding a bike. If you find a problem, ask around for a solution; odds are someone has already figured it out. Bike to Work Week may not convert you to a spandex-loving gear head, but it might provide you with a new, fun weekly goal.