Reply To: Japan in August
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Hard call… the only thing I would say is that be sure to leave time to get back to your international airport in case there is a delay.
Miyakojima has pretty beaches but none are accessible as far as I know. Same for Ishigaki, but it has several islands to explore. The main island has a few accessible beaches but you will need a car / taxi to get around.
https://www.accessible-japan.com/places/japan/okinawa-1/nanjo/attractions/azama-sun-sun-beach/