Officially, parking is charged per car, per night. Guests should let the front desk know the number of cars being parked.
In practice, GCH does not closely track Self-Parking.
Once a guest pays for 1 car, all room key card will have "SELF PARKING" printed on them.
A room key will be needed to both enter and leave the self parking lot. The CM at the parking lot will visually check the key, but they are not scanned or logged.