Park at the Spy Cave car park.
(S/E) Take the path that heads straight into the woods. The path is dotted with fitness equipment. Continue straight along the path until you reach a series of beams for a balancing exercise.
(1) Turn right and head slightly uphill. A little further up, turn left onto the path leading down towards the Orneau valley. The area is criss-crossed with small paths offering circular loops and shortcuts. You can take these to vary the route without fear of getting lost.
(2) After a fairly steep descent in the final few metres, turn left as you catch sight of the railway line at the tree line. A little further on, avoid a passage under the tracks that leads out of the woods by following the Orneau, but you can take a moment to get closer to the stream (see map).
Head north-east to rejoin the path and turn right. Continue straight on along the path which runs alongside the Orneau and some wetlands. The area is very damp but well-graveled. The path is slightly muddy and requires crossing a stream. In wet weather, it is best to wear waterproof shoes or boots.
(3) As you emerge from the woods, near the Goyet farm, continue straight on, taking the path that climbs gently alongside the fields. This path curves to the left and enters the Bètche aux Roches woods. Ignore the paths branching off to the right and proceed to a junction.
(4) Take the narrower path branching off to the left. Turn left, then right to rejoin the original path. Turn right to reach the car park a short distance away (S/E).