Start at Bougival station (La Celle-Saint-Cloud) on the Transilien L line (Paris-Saint-Lazare sector).
(S/E) On leaving the station, cross the car park and at the roundabout take thesecond road on the left (Mail du Bois Brûlé); after 50 metres, enter the Bois de Louveciennes via the path on the right and then follow the fitness trail to the Skatepark de l’Étang sec.
(1) Turn right onto the small road called Chemin de l’Étang, leave the forest and follow the road to the entrance of the Parc des Trois Grilles.
(2) Cross the park diagonally and continue along Rue de la Red Cross until you reach a T-junction. Turn left onto Rue des Voisins. Turn right onto Rue Traversière, then left onto Rue de la Princesse, and you will reach the junction with Chemin de la Machine.
(3) Turn right onto it, follow it, then veer right to reach the entrance to the Parc des Granges du Barry.
(4) Turn right into the park. At the Comtesse du Barry’s music pavilion, the path descends steeply, near the aqueduct that rises from the Seine above the Machine de Marly.
Reach Quai Rennequin-Sualem, turn left onto it and arrive near the Pavillon Charles X, the last remaining vestige of the famous Machine de Marly.
(5) Turn left to reach the pedestrian crossing, using caution to cross the busy Quai de Conti. Cross the Pont Abbé Pierre and step onto the Île de la Loge just downstream of the Bougival Locks.
(6) Follow the single road downstream. At the sports grounds after the Emmaüs premises, take the footbridge to leave the island.
(7) Cross the Port Marly footbridge and follow Chemin des Hérons to the right until you reach the roundabout. Take Rue Jean Jaurès opposite, pass under Avenue Simon Vouet and cross Route de Versailles to reach Chemin du Haut des Ormes, which leads to the Centre Hospitalier de l’Europe. Cross the centre to reach the entrance to the Château de Monte-Cristo.
(8) Continue along Chemin des Montferrands, which joins the D7; leave it after 50 metres to reach the Grandes Terres estate. Cross it via a path that climbs up to the school complex. Follow Allée du Mississippi to the right and reach Parc Jean Witold.
(9) Turn left onto Allée des Épines, then Allée des Vignes, and join Rue de l’Abreuvoir at the junction with Route de Versailles. Continue down Rue de l’Abreuvoir. You will arrive at the Abreuvoir de Marly.
(10) Pass it on your left and head back up along the D386. Cross the road with great care at the entrance to Parc de Marly.
(11) Walk up through the Parc du Domaine Royal de Marly to the gate near the museum. On the other side of the roundabout, enter the Square de la Pelouse. After crossing Rue du Maréchal Joffre at the park exit, continue along Chemin de la Chasse du Roi and follow a path leading back to the skatepark in Parc de l’Étang sec.
(1) Return to the station via the reverse route of the outward journey (S/E).