Where abouts do you live there David?
I'm in the Keramas, an island chain 25 miles west of the Okinawan mainland. Ishigaki is a couple hundred miles SW of the mainland.
Most of the good Okinawa GT fishing is here in my island chain (the Tokaras are proximately close to Okinawa, but technically in the next prefecture north) and I don't think many residents here are serious GT fishermen. Those people are mostly coming off the Japanese mainland via the Okinawan mainland. The store that does those charters only hits the North and East of the chain, too, so there's a lot of water I'll have to myself with my kayak. Pictures of fish taken from the Keramas can be seen here:
http://www.yosemiya.com/J2002frame.htmClick on the second drop down menu on the left to select January-July or October-December. All the text is showing up as gibberish on my home computer, but the biggest fish are in the 45kg range.