Second the area south of mallaig, around arisaig and camusdarrach. Beaches truly amazing, great ww2 history in the area in a cracking little museum in arisaig, with very interesting Special Operations Executive bits in there. Yanks would love that. Easy, short trip to Eigg (climb An sgurr?) or Muck to experience island life. Visit Glenfinnan on the way too – great history stuff in stunning location and see the steam train pass over the Harry Potter viaduct!
I think Torridon (with a trip to Skye, via Plockton) would be great too, but the first suggestion is pretty accessible. And watching the sun go down over the islands from that part of the world is breathtaking.