The way points of this running / walking route:
Turn left at the sign - going straight on is the GR4 if you want to skip seeing the borrie
The borrie is clearly signed as a descent at the juntion of paths once you emerge from the stream valley
The Borrie
Under the electricity cables there is a path that wiggles up the hill left - take this instead of going all the way back to the GR4
The GR4 appears just before you get to a building. Take this and don't stay ont he track
You've done the major up now its easy...
If you don't feel like going to the observatory you can take the signed trail right
The highest point is in fact a water tank. You can climb on it and admire the giant golf ball in the seawards direction
continue straight on pass the stone building
The path turns sharp right here. It is marked with a couple of cairns and a faded yellow paint stripe but it's easy to miss
As you start the descent into the valley stop following the vehicle track as the path contours through the wood on the right. Again it is marked with a cairn and faded yellow paint blob but it's easy to miss
you need to cross the track not stay on it
again do not be distracted by vehicle tracks
Now you join a track and stay on it all the way back to the original turn off to the borrie just above Cipieres
The yellow marked path is supposed to contune contouring around here but it's extremely overgrown so don't try it