If you park at Dog Falls, there’s an easy track leading SW along the banks of Loch Beinn a’Mheadhoin. That’ll take you round to Loch Affric and the landie track all the way to the Western end of the Loch. From here, cross the river at Athnamulloch and head further West on the very stony track all the way to the Youth Hostel at Alltbeithe. If you really want to bothy, then head further South West to Camban. A simple return is to headd back to Loch Affric and take the footpath on the North side of the Loch. Either use the tarmac now, or cross to the South track again back to Dog Falls.
Extending this to Morvich via Glen Lichd and returning via Bealach an Sgairne wouldn’t be out of the question. There would be a couple of spts where you’d want to dismount. Do NOT be tempted by An Caorann Mor to Cluanie.
I have some photos of part of this route taken last Autumn.
(click to see more)