So the $30 daily resort fee does not bother you but $18 per day parking does?
That Hilton is very close to Disney Springs, so once you unload your bags, just drive over to the Lime Garage and park there. Or go over to Saratoga Springs and tell the gate attendant you are visiting then park there and walk across the street back to your room.
Or go down to the Goodings shopping center at the end of Hotel Plaza Blvd. and park there and walk back to the Hilton.
Or visit OKW or POR, park there and take the boat back to DS and then walk back to your room.
Or park somewhere over on International Drive, take a Mears bus to Disney Springs then walk back over to the Hilton.
Or if the $18 parking fee is a deal breaker, cancel the reservation and book somewhere else that is either $18 less per day or has free parking.
Or stay at a just as nice but not nearly as costly place over on Palm Parkway, save a few extra bucks and only add about five minutes to your drive. We have stayed at several places over there for a night or two prior to a week a WDW and it works just fine.
Or pay the $18 and park right at your hotel and maybe spend $18 less per day on food and drink than you had originally budgeted for.
Lots of options.