$17 Self Park, $24 Valet park
http://www.hilton.com/en/hi/hotels/maps_directions.jhtml?ctyhocn=PITPHHFparking
Mon Wharf Parking
$8 to enter. Closed after 1pm Friday, but you can still get in. No attendant there to watch the cars.
http://www.city.pittsburgh.pa.us/pghparkingauthority/html/monongahela_wharf.html