Panther Creek in Morristown TN, Haws Ridge in Knoxville, TN is a great place to ride (and crash), Warriors Path in Kingsport, TN also a great one. Locally in Greeneville we got paint creek and that systme has unbelivable trails and service roads to ride on.
Bays Mt. in kingsport is a great trail. ETSU has a very challenging trail; and there is a very good beginner trail very locally in Davy Crockett Birthplace State Park.