There are many places to visit in this small island. The Shuri castle is incredibly beautiful.
The peace memorial with names of Okinawa, japanese and american people who died during the war. All together as one.
The stalagmite and stalactite cave is just extraordinary.
I went to Okinawa five years ago, to a festival call Uchinanchu. All the descendants from Okinawa go there every five years. Its an amazing festival.
Dont forget to go to the aquarium. Its a must see! and the beach!