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Start from the Grille Royale, right next to the Musée-Promenade. Parking is available in a small car park overlooking the roundabout where the N186 meets the D386. Access via the A13, exit "Saint-Germain-en-Laye" (near the roundabout, do not take the small tunnel that leads to the centre of Marly-le-Roi).
No signage
(S/E) Go through the Grille Royale and pass the Musée-Promenade on your left. At the roundabout, take the first lane on the left (statues) then turn left to pass between two stone pillars. Follow a wide, stable path to the south-west, ignoring the paths on either side.
Just before a forest gate leading to a small road, turn right and follow theGR®1for a short distance. At the fork that appears immediately, take the path on the left (leave theGR®1going downhill to the right; curiously, on the section that follows, theGR® is poorly maintained and is starting to be overgrown with grass). Follow this good path, ignoring a path on the right, and you will come to a roundabout at the top of a large lawn, the Tapis Vert (beautiful view of the Parc de Marly).
Red and white markings
(2) Then follow theGR®1opposite on a small road that descends slightly. After about 150m, turn left onto a path that leads into the woods (large stump with signposts). Ignore two paths on the left. At the top of a small hill, with a small road on your left, turn right into a sparse wood (masonry structure on the left). At the T-junction that follows, take the wide lane on the right and follow it for a few metres.
No signposts
At the next junction, leave theGR®1 trailas it turns left into the wide lane and take the narrower path that starts just to the right of this lane (north-northeast, ignore a less marked path further to the right). When you reach a clearing (wire fence on the left), turn right and go down a steep slope (beautiful view of the park and the Route de la Grille Royale). Continue downhill east-southeast on a path and then down some steps. At the bottom of the descent, go around a round lawn on the left and continue straight ahead to the ruins of the old castle (information board, statues).
(3) Turn left at a right angle and head across the lawns (which you are allowed to walk on) towards the "Le Grand Miroir" pond, going down a series of steps and going around a reed bed on the left. Walk along the pond on your right. At the end, turn left to join a wide path which you take on the right to reach the Terrasse de l'Abreuvoir (the two groups of statues "Les Chevaux de Marly" are located on either side).
(4) After the second group of statues, take the wide, uphill path lined with plane trees to the south-east. Ignore the paths on the right. At the gate, leave the path that continues uphill and turn right onto a small, flat, stable path (do not take the path further to the right that goes downhill). Go around a mound on the right and pass in front of the remains of the guest pavilions (information board). Cross a sort of grove and you will come to the remains of the castle, on the other side from where you came.
(5) Turn left at a right angle (east-southeast) and go up the large paved driveway that leads to the Grille Royale, the starting point (S/E)
Visorando Member
Difficult 
Moderate 
