Your post is a bit vague. Have you ever been in the area? What kind of riding interests you? How far do you want to go?

Nearby, there's some nice road biking outside of Pigeon Forge toward Maryville/Alcoa.

I don't have a mountain bike and I've never looked to rent a bike, so I can't help much there. My sense is that it may be difficult finding a good road bike in Pigeon Forge.