With respect to the rootsweb reference.... I'm reasionably well read concerning McIntosh County history.
Sapelo Island has always been known as Sapelo since the time the Spanish settled a mission there in the 1500s - in the neighborhood of 200 years before English influence/settlement on the Georgia coast. If my research serves me correctly, Blackbeard Island was considered a part of Sapelo until the late 1700s, well after the time Ft. King George was first built/abandoned in Darien in the 1720s. Oglethorpe recruited the Scots to resettle Darien in the 1730s, as St. Andrews Parish, to serve as a buffer between the Spanish in St. Augustine and his colony of Savannah. Fort Frederica was also built and manned on St. Simon's Island in Glynn County.
What most folks aren't aware of is the Spanish colonized most of the Georgia coast in the 1500s - St. Catherine's Island north of the Sapelo channel had a mission on it, and there were a number on the mainland here in McIntosh as well as other counties. However, due to a lack of exploitable resources (read precious metals?) and hostility of the Guale natives, most all missions in GA were abandoned in the 1600s. NO reference to treasure in any of my historical readings concerning the missions, BUT -----
There are references to the Guale natives possessing Spanish gold made by the early English. This is generally attributed to shipwreck/beach recovery, and possibly trade with natives of Florida. Archologicial study has supported this with finds made at native sites by dating finds to the times of the Spanish fleet disasters.
Nope.... I don't think there's any basis to any of the "pirate treasure" tales as known by the general public concerning the Georgia coast. However.... the possibility of unknown/documented hoards may exist.
Then we have slave smuggling, blockade running, liquor smuggling during Prohibition, and drug running going on for for the past nearly three hundred years.....
There probably is some stuff out there.....
That's why I hang out in the stacks.....
Good luck, all....
Robin