First off, let me start by saying I'd LOVE to do this, particularly with a modern Hand Launched Glider . . .
That being said, with the exception of the holes where the green is obscured from the tees (Edgewater has a few, but doesn't look to be that many) none of these holes are outside of range of a modern hand launched glider. Heck, most of the glide tests (you know, the easy overhand toss at flying speed) I run on any of my DLGs will go half the distance to most of the holes. A proper throw could hit the greens of any of the holes in dead air . . . assuming the pilot could see them.
Playing an 18 on a round of golf would make you a Golfing God (or a gullible communist dictator of an isolated regime). For Glider Golf, with the typical course ranges, all it would take is good equipment, a clear view, good depth perception and a good day of throwing. Favorable winds would help, but starting the run an hour before dusk would give you all the dead air you'd need.
BTW, have I mentioned How I'd love to do this?!? In a typical glider contest "Landing out" of the pilot box is a HEAUGE no-no and in the latest rules earns a zero score for the flight. In this contest, you're targeting the green instead, navigating around obstacles at a distance . . . an interesting stretch of piloting skills