[Firebird]

I guess Naha would be your best bet for nightlife and shopping arcades. There is a Hostel called Okinawa Base where a bed in a 4bed dorm is 1000yen. Its a bit away from the Mainroad but you get free intenet, washingmashine, and a free rental cycle for a few hours. Okinawa is cheaper than the mainland, if you watch what youre doing. Rental scooters go from 1500yen a day, less if you rent weekly. A rental car can start at 3000yen a day! That is if you are not in the main season (Golden week, Obon,....).

I dont know hotels with private bathrooms, sorry, but maybe someone else knows? Otherwise try to see in the lonely planet?