Park in the large car park located past the Ristolas holiday centre.
(S/E) Take the road, walk past the church and begin the climb until you reach the Ségure Valley Forest Track. Turn left onto it and follow the yellow markings. You’ll reach a junction with 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; this is an error as it actually continues, which is also indicated on the OSM map.
Continue along the track up 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, after a steady climb, reach Lower Lacroix Lake.
(3) Follow the route back in the opposite direction to return at a leisurely pace to the Ristolas car park (S/E).