Start at Passins Castle (gate or inside if you’re a guest).
(S/E) Return to the road and head down to the right to the large farm below.
(1) Before the buildings, take the path on the left (hairpin bend). Follow this path, keeping to the left, to make a wide curve through the Bois de Montolivet. You’ll reach a junction with a path on the right coming from outside the woods.
(2) Ignore it and continue through the woods, keeping to the left, until you reach the junction with another path also coming from the right.
(3) Ignore it, go straight on for a few dozen metres, then turn left and continue uphill. Leave the woods and continue along the edge of the field.
(4) Take the path on the left between the fields. You’ll come out onto the road above the castle. Head back down to the left until you reach the path leading to the castle, then turn right to return to your starting point (S/E).