There's a cool spot in the Smokey Mountains called Cades Cove. This valley has an 11mi. loop around it. The park is only open to bicycles on Saturday mornings (Too Cool!)The road is (or was) paved but it has pot holes, dirt, rock, etc. over it. It's perfect for a mountain bike, but my oldest son uses mine so I plan to use the new bike for this and other trips.
Sorry to ramble- the point is- the bike will need to be a Jack of all trades.