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Departure from Saint-Germain-en-Laye RER station. Take the exit towards the château and you will come out in front of it.
Note: in the forest, the paths taken are called roads on signs and maps, but they are not paved; they are wide dirt tracks, pleasant for walking.
No signposts
(S) Enter the castle grounds and walk along the right-hand side. When you reach the terrace, turn left. Continue to the viewpoint (orientation table).
(1) Continue north-northeast on the terrace for about 2.4 km (enjoy the view of western Paris).
Red and yellow markings
(2) At the end of the terrace, turn left to exit the grounds via the Grille Royale. At the crossroads, go down to the right. Cross the D 157 carefully and go up the path opposite to the Château du Val.
(3) Walk past the château, cross the road and continue straight ahead on Route de la Grille Royale. Cross the Étoile de la Porte Verte and continue straight ahead on the same road. Cross the Étoile Lamarck and continue straight ahead for another 200 m.
(4) Take thefirst path on the right. Cross a bridle path and continue along theGRP® trail, which winds through the undergrowth and crosses other paths (follow the markings carefully). Join Route de Bourbon and follow it to the right until you reach Étoile de Vaux.
No markings
(5) Then take thefourth left (north-east), a path that starts to the right of the Route forestière de Brancas (leave theGRP®). At the next crossroads, go straight ahead. Ignore all the paths on the right, pass a forest barrier, rejoin the tarmac road and you will soon come out onto Rue de la Marne at the entrance to Mesnil-le-Roi.
(6) Follow Rue de la Marne to the right. Take thefirst right and, at the fork that immediately appears, turn right into Allée François Premier. Cross a housing estate. At the T-junction, turn left onto Rue du Général Leclerc. At the fork, turn right into Rue Carnot.
(7) After a few dozen metres, turn left to reach the chevet of the church. Go around the church on the right. Come out onto Rue de l'Église and follow it to the right. At the crossroads, turn left onto Rue de la Marne.
(6) At the fork you took on the way there, continue straight ahead. At the gate to the orangery park, continue straight ahead to re-enter the forest. Walk west-northwest to the Étoile du Chêne Corbeau.
Red and yellow markings
(8) Then take thefirst path on the right. Carefully cross the D 308 and take the Route des Ventes de Châtillon (north) opposite.
(9) At the crossroads, take thesecond path on the left, which leads away from Route Monsieur. At the next crossroads, continue straight ahead. Join another path, follow it to the left and cross Avenue de la Muette (wide bridle path).
(10) At the next intersection, after a good hundred metres, turn right. Go straight ahead (north) and cross several perpendicular paths. Join Route du Maître Particulier and follow it to the right.
(11) At the large crossroads, take thesecond left, a wide track, and cross the bridge over the railway tracks. Continue straight ahead, cross a road and continue to the Pavillon de la Muette. Go around this building on the left (make a quarter turn).
(12) Then turn left onto Route d'Andresy (west-northwest).
No signposts
After about 400 m, go straight ahead (leaving theGRP® trail on your left). At the Étoile de la Sablonnière, continue straight ahead.
Red and yellow markings
(13) At Étoile du Renard, take thesecond path on the right and rejoin theGRP®. Continue straight down to Étoile Sainte-Honorine. Then turn left and you will soon reach the eastern tip of Étang du Corra.
(14) Go around the lake on the right. At the north-western tip (a small beach), continue straight ahead. Follow the markings carefully to leave the forest at the edge of the N 184.
(15) Follow the markings and the Paris-London cycle path along the N184 slip road. Turn right onto the cycle path, then turn left into Cité des Garennes. At the T-junction, turn right. Ignore a turn-off on the left and, at the T-junction, turn left.
(16) At the junction on the edge of the N 184, turn right. Continue straight ahead and take the footbridge over the Seine.
Red and white markings
(17) On the other side, go down to the riverbank and walk along the river on your right until you reach the barge chapel.
(18) Turn around on the riverbank and go under the road bridge. Just before the railway bridge, climb a flight of steps on the right and carefully cross the D 48. Continue straight ahead to Conflans-Fin-d'Oise station (S/E).
Visorando member
Easy 
