In reply to Wonrek:
I haven't tried that yet but want to soon. I can think of bits of it that i have run where you could easily just keep on running and run right off. Coming out of Portreath, for example, toward Basset cove.
I meant to to do a srretch of the Breton coast path, the GR34, by night a couple of weeks ago, but did it by day instead. There were a couple of places on that where you are really close to a fatal drop