We like Unicoi. Pretty scenery, good hiking, nice lake there. Power and water, no sewer hookup. Don't know what kind of rig you have, but the roads were a little tight with my 40 footer. Not impossible, just had to take her around some corners a little slow. As with all GA state parks, you cannot reserve specific sites. Not a big deal unless you have a specific spot in mind, or you need an especially long site for your set up. We've camped there a couple of times and will do so again.
Jeff, Tricia, 3 kids, and the occasional dog or two
2006 Winnebago Tour 40KD, 2013 Dodge Ram TOAD
350 Cat C7, Freightliner chassis