I'm a local and walk there when I want to visit. I do know that with purchase(s) you can have your parking validated. I believe the purchase(s) have to be $20 or more and that gets you a discounted rate. Not sure where in the mall to have parking validated other than the security podium at the entrance adjacent to Neiman Marcus - Last Call. Hope this helps and enjoy your visit!
I am not sure about parking fees, we stayed within walking distance of the Riverwalk Outlet.
Parking is validated at several stores throughout the mall with a $20 purchase. The validation takes $8 off whatever your parking fee ends up being. For example If you are there 8 hrs or more, typical fee is $21 so after the validation it would drop to $13. Only the Hilton garages and the open air lot by the convention center validate for the mall. During special events the Hilton doesn't allow the discounted validation, so make sure to check beforehand!
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