Park in one of the car parks at the Col de la Schlucht.
(S/E) Head east on the D417 and quickly turn right onto the Sentier des Roches, marked with a blue rectangle. This is also theGR®531, just to the left of the Chalet bar/hotel. Follow the Sentier des Roches for about 1 km until you reach a picnic table with a breathtaking view of the valley.
(1) Continue walking for about 500 m until you reach a narrow passage in the cliff.
Cross it, then continue along the Sentier des Roches for about 1 km until you cross a small bridge over a stream.
Continue for a few metres to reach Krappenfels, which marks the end of the Sentier des Roches.
(2) Now take a more passable path. Continue downhill until you reach the Tourbière crossroads.
(3) Turn right onto the forest road, still marked with blue rectangles, and climb towards Frankenthal.
(4) Cross the Petite Fecht stream and continue until you reach the Frankenthal inn.
(5) Continue straight ahead, following the path marked with a red triangle. First uphill, then downhill, you will come to the Schaeferthal farm.
(6) After the farm, cross the first path and then take the second path on the left marked with a red rectangle. Go around the Schiessroth farm and follow the path that winds down to the Schiessrothried Lake. After the last bend, you will come to a crossroads. Turn left to reach the Schiessrothried Lake.
(7) Cross the dyke and at the end follow the path on the left, marked with a red rectangle, to reach Lac de Fischboedle
(8) Take the dam, join the forest road and continue to the right until you see a path on the right that climbs up the mountain.
(9) Take this difficult path on the right. Follow a few tight bends and join a path marked with a blue cross in a hairpin bend.
(10) Turn right onto this path, signposted: vers Kerbholz Kastelberg. You will reach another intersection. Stay on the Blue Cross path and climb up to Kerbholz.
(11) Turn right onto the Rectangle Bleu trail towards Lac de Schiessrothried.
This is a very technical section on the mountainside. You will be climbing scree, ladders, etc. Please note: some of the safety lines installed by the Club Vosgien are a little too loose.
You will then reach a stream at the entrance to an area of scree.
(12) Cross the scree, taking care of your ankles and watching out for loose rocks. Continue along the trail to reach the1st Spitzkoepfe viewpoint. Enjoy the view from the viewpoint, then continue towards Lac du Schiessrothried until you reach the junction with the trail coming from the lake dam.
(13) Turn left towards Wormspel, following the blue triangle markings. Begin another climb, reach Wormspel, continue and come out at a large 5-way crossroads.
(14) Take thesecond path on the right, where the markings change to red, white and red rectangles. You will come to another major crossroads at Col de Falimont.
(15) Follow theGR®5Red Rectangle trail opposite, keeping to it to return to the Col de la Schlucht car park (S/E).

In terms of time, we finished in 7 hours, including an hour's break at Schiessrothried Lake and a few other shorter breaks. Definitely worth doing if you're fit enough!