If you want to travel outside of Waikiki (which doesn't really count as Hawaii IMHO) and a few popular tourist destinations I think you're going to want to rent

If you want to travel outside of Waikiki (which doesn't really count as Hawaii IMHO) and a few popular tourist destinations I think you're going to want to rent a car. Of course I'm not saying that the majority of tourists should rent a car. Additionally the bus has restrictions on how much luggage you can carry, typically you can only bring a mid-size suitcase each (it has to fit on or under your seat).