I love having a car. Definitely Island car rental. Had a mash up many years back and they were very good and honest to deal with. Make sure you take a video of the whole car when you do the inspection and don't let them Hussle you at drop off about anything. Was worse in the old days before phone video.
I follow the taxis as they know the potholes, but not too close as they stop a lot. I have also been pulled for speeding and got a ticket once so keep an eye when the speed changes. Drivers usually fllash their lights like here but you have to pay attention. I like exploring so enjoy the freedom. And agree with the cost comparison these days. Gas is about $4 a gallon. Also make sure you can open the gas tank. That hung me up for a bit one time��