In reply to pasbury:
I remember driving that in the dark, with the fuel light on, with a big drop to the sea appearing frequently. Then the castle appeared like something out of a Horror film.
If you get to the end, you can camp on the beach. There is now a toilet block and a room to sit in and take in the view, for when your tent has blown away. If you look really hard, and squint a bit, you can see Canada...
You can also camp at Uig sands on Lewis. Though it is not quite a wild as it was. Horgabost on Harris is a good campsite. You can also follow the road round the bottom of the island in a loop.