A walk on a dragon's back

You start by going up a steep hill to an Iron Age Fort. Then you go down the other side, and up and down the switchback of the dragon's back. After a bit you get this view back - the dragon's back is on the right. And so on to the highest point of the Black Mountains at Waun Fach (810m) and then down to a woollen line, on down and round, past a field of alpacas and, after 7 miles of walking through cloud, sun, bog and squidge, back to the car. Great day.