The route from Adliswil to Horgen is a pleasant hike along the River Sihl and over the Zimmerberg mountain. After leaving Adliswil, the path hugs the river through Langnau am Albis («Langnau a.A.» for short) and Gattikon as far as the Sihltal Zürich Uetliberg Bahn (SZU) station. From there, you leave the Sihltal valley and climb through the forest, over the Zimmerberg and then down to the lake at Horgen.