I'm ridden part of it in Tennessee. It was nice, with some rolling hills. I enjoyed it, but I've heard that the southern part of it the Trace is pretty boring, and I have to admit that even the section I rode was pretty monotonous. At least when I rode it (last June on a Sunday morning), there were more cars than bikes, which was nice, and the road surface was smooth. I've read that certain sections have rougher pavement, however.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher