Visiting Islands in Okinawa - a lot of pop-up adverts but an excellent page nevertheless :)
The Tide Pools of Okinawa - this page says the sand is made up of foraminiferans, single celled protozoans.
Some lovely photos of Taketomi Island
Taketomi Visual Tour page - practice patience whilst waiting for this page to load. Go & make yourself a nice
cup of tea or something :)
Another search - I got diconnected b4 checking many of these out ... :)