The Loisach-Isar canal-Pupplinger Au loop from Wolfratshausen is a more difficult hike. You should have good basic fitness for this route. Sturdy shoes, a certain amount of surefootedness and a little alpine experience are also very helpful for successfully mastering this trail.
The starting point is the Wolfratshausen railway station, which can be reached by public transport. After 13.5 km, you reach the confluence of the Loisach and Isar rivers via the Loisach bridge, the Farcheter Wehr, the Pupplinger Au and the Isarspitz. A challenging hike with many wonderful viewpoints.