Loch on one side mountain on the other. Lovely and pretty. Very undulating and quite narrow. Not a fast road, beware of coaches which, somehow, manage to squeeze down here sometimes. Definitely a nice alternative to the much busier A83 if you have time.
From the roundabout at whistlefield head north on the A814 towards Arrochar, plenty of bumps and jumps to enjoy, nice scenery and relatively quiet. Watch out for dozy fishermen and campers pulling out from layby's. When you get to Arrochar enjoy a roll and a cuppa with Dunky in the Pit Stop Diner.