In reply to Russell Lovett:
If it's windy, I'd go to the shores of Loch Coire Mhic Fhearchair for a bit of shelter, and a swim. I've never known the water to be over 7°C. Refreshing morning dip. Not a summit but a great place.
If it's calm and the views are open, I'd go to the summit plateau of Beinn a Chearcaill. Despite being a simple and unchallenging route, it's a strange and other-worldly place. Fascinating rock structure on the plateau with the cracking and the small erratics, and the view is stunning.