I prefer New Spring parking lot since it is paved. The shuttle service is great. Picks you up and drops you off at DK Stadium roundabout. Pick up is there after the game and the shuttles have a dedicated side of the highway so it is really pretty quick. Your biggest issue would be getting back to Greenville. Exiting Clemson by that parking lot would be easy...Getting back around may not be. May be easier just to travel out to 85 the other direction and then go north. Or track your way up to 183 if you are in Northern Greenville.