Those are your commercial options. As for bizjets, in the winter 5500 feet on a dry surface is normally sufficient for a hop to/from the northeast. I was there a year ago. Decent ramp space for a small general aviation airport.
Glynco Airport? Yeah, I was just addressing the commercial question.
I saw the Blue Angels there 20 years ago or so. Awesome venue for that, not very crowded.
The Federal Law Enforcement Training Center (FLETC) is a couple miles away. Adds to the security aspect for all the high-rollers.
The G8 Summit was held at The Cloister a few years ago. Good geography for security and not very hospitable to OWS-type protestors were among the plus points for the venue, I’m sure.