I did the ride a few years back, it was great even though it was a little cool out. As for where to park your car, there should be some parking by the finish, and since the ride shouldn't take you more then a couple hours I'm sure it won't be that expensive. Then again they might decide to jack up the price that day because they know a lot of people will need a place to park their car.
Anyhow, good luck!
smilez