All the edges! - a chap from work did that one last month for some sort of charity thing in aid of the MRT, he said even his dog was tired afterwards!
I'd love to have a go at that, I don't know the Stanage area at all really (it is on my 'to do' list).
It's certainly a walk with more balls than the one I suggested, though I still have to work up to the 20(+) milers...