You'll need to buy the National Geographic map – there are no good free maps for the area.
1. About 18 or 19 miles – Start at Bandy Creek – Katie Trail – Jacks Ridge Loop – Laurel Fork Creek Trail east – John Muir Trail south – Fall Branch trail – John Litton Farm loop south
Some nice walking along the river, and some walking along the ridge. I would think this would make a nice fall colors hike.
Nice camping along laurel fork creek trail
2. Another option would be to head farther north to Charit Creek lodge, adding about 2-3 miles.
http://www.charitcreek.com/
At Charit you could make reservations for breakfast or dinner – might be a nice option for a first timer who isn't too keen on backpacking food. Or you can stay overnight one night $60PP with breakfast and dinner You could then hike east on station camp creek trail.
Also nice camping about 1/4 mile down twin arches trail coming from Charit creek lodge, on the islands in the middle of the river, just after the horse trail turns off to the left.
The other loop I had in mind is going to be a bit longer. You can drive over to twin arches and hike down there (1/2 mile?) if you have the time.
CM