From Bayonne, head towards Saint-Jean-Pied-de-Port. In Bidaray, cross the bridge and immediately turn right. Very quickly, head to the left bank of the Bastan via a second bridge. Follow the stream, keeping all road junctions on your right. You will reach the Pont d'Enfer bridge. Very quickly, leave the main road that continues along the Bastan and turn left. Park above the Basasagarra farm. There is only space to park a few cars.
(S/E) Go down the road, then take the track to a bridge, which you cross. Pass in front of the old Sumusa venta and you will come to a fork.
(1) Take a path on the left and immediately turn left again to take a trail that winds through the ferns towards the summit of Ezquieta. You will reach a plateau.
(2) Go around the summit on the right to reach the pass of the same name via a contour line.
(3) Continue along the path to the edge of the forest. Follow the slightly cairned path that heads to the right to reach the north-east ridge.
(4) Turn left and follow the ridge to its summit, bypassing any rocky obstacles.
(5) Magnificent 360° viewpoint with views of all the surrounding and more distant peaks.
After a short rest, descend south-west to a pass at altitude 835.
(6) The trail climbs 25 metres and then descends 40 metres to the next pass at altitude 821.
(7) Find the start of the trail that enters the forest, heading northwest, and follow it to Col d'Oco at around 680 m.
(8) Descend to the right. The slope is steep and leads to a flat area at 480 m.
(9) Follow a contour line to the left until you reach the forest.
(10) Follow the path down into the forest to Aritzacun
(11) Just before the stream, take a path that branches off to the right. Initially heading south, it then turns east and then north-east. It follows the stream on the right bank for about 1 km until it reaches a bridge.
(12) Cross the bridge and join a track suitable for vehicles. Follow this track until you reach the top of the Basasagarra farm (S/E).
. But that's also part of the fun of hiking.