If you rent from the resort, or make another type of "hotel reservation," there is a parking fee.
If you make a timeshare reservation/exchange, there is no parking fee, or resort fee, but there is a local tax, of $6-14 per day, depending on the unit size.
This link is on your confirmation (if you have a Starwood timeshare confirmation):
Complimentary self-parking is available to Owners and external exchange guests at the resort. Recreational vehicles, trailers and oversized vehicles cannot be parked at the resort. Please contact the resort for information about alternative parking.