Thanks for the reply! I am flying into Honolulu 2 days before the cruise so that I can get used to the time change and to do some sightseeing on Oahu. I hadn't thought about renting a car, but that is something else to consider. I've been reading up on the places I want to see when I'm there but renting a car would give me the opportunity to see some of the "off the beaten path" parts of Hawaii.
Enjoy your trip and, if you think about it, give a review when you get back.