I am another fan of the Smokey Mountains in Tennessee. My husband and I actually had our wedding and honeymoon there.
October would be a beautiful month as you would have the fall colors and changing leaves. There is also alot to do in Tennessee. We were in Townsend, which is close to Pigeon Forge and Gatlinburg.
I have a website and I have some pictures on there if you would like to see them. Todays Destination Weddings - Planning - Suggestions)