I am cruising from San Diego to Hawaii in November. The cruise stops in Hilo, Kona, Honolulu, Nawiliwili and Lahaina. I would prefer to explore the Islands on my own rather than as part of an excursion arrange by the cruise. Is is possible to rent a car at each of these ports? Will the rental agency pick us up at the port? How long does the process take (I don't want to spend alot of precious time in a car rental office completing paperwork)? Does anyone have good sugestions as to which agency I should use?