There is a large car park at the Col du Boenlesgrab.
(S/E) From the pass, take the second road on the right as you leave the inn. This road climbs slightly. Head east and you will reach a large crossroads (the Plaine de Rouffac).
(1) Ignore the main paths and take a small path slightly to the right, which descends at the beginning and enters the woods. This very pleasant path stays on the side of the mountain and joins another large crossroads (Taefelen).
(2) Turn sharp left onto the wide path. This path is fairly level and undulates with the curves of the mountain. Ignore a main road coming from the right and reach another large crossroads (Hirtzenstein).
(3) Turn left onto Chemin du Général and follow this south-west facing path.
(4) After one kilometre, a forest path begins on the right. The path is not well marked, but you should generally stay on the ridge and reach the summit ahead.
(5) At the summit of Rundkopf, descend straight ahead. This time, the path is well marked and takes you back to the first major crossroads you encountered on the way up, the Plaine de Rouffach.
(1) Take the main path you took on the way up, which is almost opposite, and follow it back to your starting point (S/E).
. Otherwise, watch out for the final climb, which is quite steep :p