Did this in 2006 - starts in Fort William - mile thru housing estate to main road, 12 miles up, 12 miles back, then mile thru estate to finish on shinty field. Really liked it - on the way back you can focus on Ben Nevis (if the weather allows) - a big help when the suffering starts. Only slight downside is traffic on the road, but this wasn't a great problem for me. Great presentation after in hall, with tea & sandwiches. Stayed over until Monday, which meant a splendid night at pub, with plenty of other marathoners taking refreshment - excellent weekend all round.