Okinawa is beautiful and safety island for visitors, it is chance to try sleeping in the car, there are camping and local parking where you can try it.
In deep night of Okinawa, you can find another world than staying hotel or Airbnb.
Stay in Camping
The camping is best way to stay in nature, there are the places to camp in Okinawa. Park in Camping area and sleeping in the car with perfect safety, restrooms, showers and cooking.
There are some camping areas rent the tent and BBQ goods, so it can be possible for tourist visitor.
Stay in Road Park (Michi-no-Eki)
One possibility for sleeping in the car is in a road park called “Michi-no-Eki” in Japanese words, meaning Road Station, parking, and toilet open 24/24, shop is open morning to evening.
You can enjoy sleeping in the car at a road park.
There are not shower in it, so you take shower at beach or go to a hot spa, cooking is not allowed, so eat at a restaurant, drinking alcohol is not prohibited but never drive after driving Japanese law is strict for drank drive.
The Michi-no-Eki is prohibited to do camping or tent, it is only parking the car allowed, also party interdicted.
Stay in Beach Side
Okinawa island has beautiful beaches, so sleeping on the beach side gives a good dream. There are some beaches equipped with 24h/24 parking and toilets for suitable sleeping in a car.
In the north Okinawa area, beautiful stars shining in the dark can be seen at the beach.
Okinawa is safety, comfortable weather, so you can try sleeping in the car even as a touristic visitor. So try to rent a car and try it, you can find another Okinawa.