Another vote for Trackrock Campground. It has a Blairsville address, but it is actually between Blairsville and Young Harris, about 15 miles or so north of Vogel SP. We prefer Trackrock because it has FHU and has a lower-key feel. There is a small lake for swimming and fishing, two nice playgrounds, horseback riding,a hay ride (Sat night), a game/TV room, and a porch full of rocking chairs. Our family has been going up there for 17 years.
As far as how to get there--call the office. Your GPS will take you the wrong way over the mountains from I-85. Debbie or Frank will know the best way to get you to Trackrock.