I concur the BRP north out of Asheville toward and up Mt. Mitchell is good riding. You can make nice loop using BRP out of Blowing Rock up over the viaduct at Grandfather Mountain and back down on Hwy 221; I have done this starting at the top going down Hwy 221 and back up the BRP near Blowing Rock. The best month to do this would be September; the BRP can get nuts with traffic during October leaf peeping season.