From Reschen old village - Altdorf, we head straight towards the Vallierteck Chapel and continue towards the Rescher Alm car park. At the car parking, turn right and follow the uphill gravel path to the alpine pasture with repeated great views of the lake landscape. At the Rescher Alm, enjoy traditional delicacies, including Kaiserschmarren, before continuing on the gravel and forest path, crossing the three-way border point in a northerly direction to the 3-Länder Enduro Trail. First on a meadow path, then narrower and partly more challenging, this trail leads from the open terrain into the forest to the Grünsee lake. After a short crank passage, reach the Schwarzsee lake. The way from Grünsee to Schwarzsee lake is technically rather arduous. Join per bike the Schwarzsee lake also using the forest road. To go back downhill to the valley, there are more choices: via forest road, or using the old "Tiefen Sommerweg'' (S1-S2, partly rough) or the family trail (no. 70, S1) to Nauders. Enduro Trail lovers continue on the 3-Länder Trail and forest road to reach Nauders and the Bergkastel valley station via the Oberer Gerry Trail (no. 69, S2) or part of the Kreuzmoos Trail (no. 68, S2) as well as the Familytrail. Once reached the valley, take the cycle path to the Reschen Pass over the border, back to the starting point.