Vail can eat my dick. $25/day for parking.
Anyway, you can go ride Breck and Keystone, while your parents ski Vail using the Summit Stage bus system, which is FREE! They have a website too. I think it is www.summitstage.com but I could be wrong.
Look it up and hitch a ride to other resorts with world-class parks worth sitting your ass on a bus for an extra hour or two of your 2-day otherwise, lame ski trip.