Park at the side of the SR48 at Passe Tre Croci.
(S/E) Go to the information board which indicates all the hikes starting from the Passe Tre Croci.
Follow trail no. 215, which also follows Alta Via no. 3 delle Dolomiti. Cross the field and enter the forest via a wide, almost flat track. There are no other trails, so it is impossible to go wrong.
In the forest, you will come to a crossroads.
(1) Keep right on trail no. 215. You will come to the edge of the forest.
(2) Continue south to reach another forest further on.
(3) Cross it and, at the exit, you will see the Sorapis refuge, where the trail joins trail 4 Dolomitenhohenweg.
Continue to the right to reach Lake Sorapis.
(4) Return by the same route to the Passe Tre Croce car park (S/E).