Realize parking is very expensive in Waikiki, so I would recommend you figure out how many days you actually plan to be driving to other parts of the island, and see whether it would be cheaper to rent a car by the day from your resort to avoid the parking charges. The bus system is very good and very cheap, and easier to use to get from one end of Waikiki to the other and to the Ala Moana mall area than dealing with a car.