At the Cauterets exit, take the Pont d'Espagne road, the D920, and turn right onto the Cambasque road, the D312W. Park in the car park after crossing the Gave de Cambasque.
(S/E) From the car park, take the track towards the cable car facilities. Continue climbing along this track on the left bank of the river.
(1) Cross a bridge over the Gave d'Ilhéou. Continue climbing on the right bank. Go around the mountain on the left. Halfway up, you will see the waterfall at the bottom on your right.
(2) Arrive at the Ilhéou waterfalls. Be careful if you approach them. Continue climbing.
(3) Cross the Gave d'Ilhéou again and continue climbing. When you see the first small lake, you are almost there. Follow theGR®10markings. Pass above Lac Noir on your right. Follow the track to the refuge and enjoy the view of the lake. You can have a bite to eat and a drink at the refuge (the owner is very friendly).
(4) For the descent, take the path in the opposite direction to the starting point (S/E).
Or: see practical information.
and it is just as quick and easier.