West coast?

Kilmartin is wondrous. Loadsa old stuff, and a decent campsite:
http://www.lochgilpheadcaravanpark.co.uk/index.htm

It's a bit of a hike to get there though, due to the extreme wiggliness of the coastline, it might be worth thinking about going via Arran, the ferries are frequent enough.

From Kilmartin to Skye, if you don't mind seriously steep hairpin bends, go via Glenelg/kylerhea where the Brochs are neat, and the ferry spins about. It's prettier than Kyle of Lochalsh.

On Skye, I can heartily reccomend the Sligachan campsite:
http://www.ukcampsite.co.uk/sites/reviews.asp?revid=1729
The views of the Cuillins are superb.

Have fun :)