Mountain biking the West Highland Way is highly recommended even for a fairly beginner mountain biker. Mostly good biking except for a couple of tough slogs up Conic Hill and the Devil's Staircase and the scenery is stunning, particularly to the north.  There are wonderful drover inns, B&B and food along the Way. Around 25-30 miles a day is a good goal, particularly if you are not used to pedalling with 10 pounds or more of luggage on the back end of your bike and it allows some time for luggage-free rides at the end of the day. Once the West Highland Way is finished, rent a car and discover for yourself that Scotland is mountain biking heaven with lots of purpose-built trails. Try Wolf Trax while staying at the Rumblie in Laggan for starters or the World Cup trails at Ben Nevi. Make sure there is lots of room on your digital memory card for photos. Do try the haggis (it is lovely and, contrary to rumours, not scary at all) with a nice Fraoch heaher beer and for dessert, don't miss the sticky toffee pudding which will immediately put back any calories you've lost. Order one dessert per person or there will be blood shed.

Cheat sheet no 1: you can get your luggage carried by various providers but what is the fun in that?

Cheat sheet no 2:  starting in Crianlarich and going north leaves you with the best of the riding and the scenery

Reminder: be courteous to walkers!

West Highland Way scenery