I would recommend HWY 620. It runs north off of Hwy. 33 east of Harrisonburg north to Hwy 211(East Lee Hwy). It is not a long one but the scenery was spectacular (made me want to move to Virgina and grow corn and cows). It is a mix of well maintained gravel and paved. We stayed at the KOA in New Market and made it a point to travel this road instead of 81 whenever possible. Have fun up there!