Park in the La Lance car park in Colmars.
(S/E) Follow the Chemin de la Waterfall, a wide track suitable for vehicles that climbs gently along the left bank of the stream. You will reach a place called Le Paroir.
(1) Head left of the stream, then return towards it to reach a small footbridge.
(2) Cross the footbridge to enter the majestic rocky cirque that is home to the Cascade de la Lance. Then begin your return journey in the opposite direction. You will then return to the La Lance car park (S/E).