re: UGA Parking/Traffic

I think the tailgating is pretty good all over campus. If you are on campus and tailgate far away from the stadium there are buses that run on campus and will bring tailgaters to the stadium for free (this includes the RV area by the intramural fields). Getting a bus back to your tailgate will be the problem.

I attended UGA for grad school and have lived in Athens for 8 years so I can provide some good restaurant/bar recommendations.

Bars: The Globe, Trappeze, Gameday Pub, Highwire, Allgood (only before the game), The Winery, Copper Creek, Harry Bissett's Bar (not liking the food there).

Restaurants: The Globe, Trappeze and Copper Creek all have good bar food and variety.
Other places vary depending on food type and price.
Depalmas, Transmet, Last Resort, East West, Casa Mia, Farm 255 are all good and reasonably priced.
Cheaper and still good: 5 Guys Burgers, 5 Star Day Cafe, Taco Stand, Little Italy pizza, Mellow Mushroom, The Grill, Weaver D's, Clocked.

You can also look online at The Flagpole magazine and look for their restaurant guide for more info.