I just rode up there last weekend. Julian Price campground on the parkway is closer to both the viaduct and the town of blowing rock, and larger than linville falls campground I think. I rode a ~30 mile loop from blowing rock along 221 to grandfather mtn., then took the parkway back to
221/ blowing rock. It was an excellent ride, low traffic, very scenic, several nice stopping points, coffee/lunch in blowing rock, etc. The decent from the rough ridge area to Julian Price must of lasted over 5 mins. @ 30+ mph!
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"