[timelesssymphony]

Yeah you need an international drivers license, as far as car rental places are concerned okinawa has a ton of them since their train transportation system is lacking compared to mainland Japan, OTS is one that immediately comes to mind, Naha is about the only city anything that resembles rail and its a monorail running to the airport from a few streets, there are buses that travel all over the place but they do stop running around 10 pm. Hope that helps.