I really liked Okinawa.
Naha was and felt very save. I walked around the city at nights not only on the main streets but also in the darkest side alleys and not a single time I was even barked at. In Bangkok, when I was walking in the side roads on the outskirts of Bangkok I was not only barked at but also attacked by the pack of dogs; blissfully I always have a stick to protect myself, however having said that, this strongly discourages from walking in the side roads and dark alleys, even in the capital city of Thailand – Bangkok.
Back to Okinawa. There are a lot of wonderful beaches on Okinawa.
Japan is rather expensive and Naha didn’t offer all types of cuisines.
I think that Tokyo would offer any and every kind of cuisines, however I haven’t been to Tokyo yet and currently Tokyo doesn’t have the high priority for visiting for me personally.
What I like about Bangkok is, that (t)here you also can find literally any kind of cuisines at very affordable prices.
In Naha I stayed in a fully equipped Airbnb apartment, which was pretty close to downtown of Naha and literally across to one of the biggest (if not the biggest) markets of Naha. Cherry on the top was that the apartment also had a balcony.
Upon the arrival I bought for cash (the only option) in the ticketing / ticket vending machine the IC card and topped up some money onto it and from that moment travelling in Naha using public transportation was an easy breeze.