Park in the large car park located after the Ristolas holiday centre.
(S/E) Take the road, pass in front of the church and begin the climb until you reach the Piste Forestière du Vallon de Ségure. Turn left and follow the yellow markings. You will reach a shortcut at a hairpin bend.
(1) Turn right onto the path to rejoin the track further up.
Note: on the IGN map, the track ends here, but this is an error as it continues, which is also mentioned on the OSM map.
Continue along the track on a long but steady climb. You will then reach the junction with the path leading to the lakes.
(2) Turn left onto the path and, following a steady climb, you will reach Lower Lacroix Lake.
(3) Take the same route back to return at a leisurely pace to the Ristolas car park (S/E).