choices in okinawa?

i am going to okinawa this summer for about 3 weeks to WWOOF (a form of volunteering) and theres quite afew locations i can choose from but i can't decide. i can go to Naha, Miyakojima, or Yomitan village. were do you think is nicest and i will get the best okinawan experience?? i was initially going to go to Naha because i do like cities, but is it very built up?? and does Naha not have any nice beaches?? i really want to go somewhere with a beautiful beach :D
any help would be appreciated!! thanks!

stay in NAHA becuase it like the heart of okinawa and the capital city so it will have the most action of any other place...and anything outside of naha that u want to see is just a short bus ride anyway

Miyakojima! Unless you need city life, which does not exist on the island.

well whats the main difference between the two?? and which has the best beach?? ^_^

I'd vote for Miyako-jima. Take a look at this one beach on Miyako-jima.

http://www.panoramio.com/photo/16217258

I would also suggest finding Miyako-jima on Google Earth and perusing the photos. You may also want to do the same for Naha.