As I got me a new mountain bike, I was looking a comfortable tour on a beginner level due to my lack of endurance.
For a long time I hadn’t been at the Sylvenstein Reservoir so I decided to go there.

The tour nicely starts along the Isar followed by a passage along the B13. After that you need to catch the bicycle path into the forest which leads you over the Sylvenstein Dam.

The next passage leads you along the B307 via the Sylvenstein bridge to Vorderriss.

Here I recommend to have a break at the Gasthof Post Vorderriss, where they serve good valuable meals. Whith you batteries reloaded you continue in the direction to Wallgau via a private road. It is free for cyclists, but costs a little when you are on a motorbike or go by car. In that lovely valley you can find many occasions for taking pictures or having a pic-nic stop!

From Wallgau the road goes down to the Walchensee which has some detours through the forest on gravel paths, but its nice, you should take them, just follow the sign to Walchensee via Einsiedl. Reaching the Walchensee you have to cycle around a small and beautiful half isle offering many spots for taking a cool bath!

From Urfeld on begins the nastyiest part: You have to climb the Kesselberg pass! But you get rewarded once you done it!
Then you can either choose the scenic tour through the forest or hammer down the road and try to be faster than the cars!

If you choose the scenic detour you should visit the Walchensee Powerplant and its museum!
Before the train ride home I had another food break at the hotel/restaurant Grauer Bär which has a beautiful beergarden right aside the Kochelsee.
Then only a short ride above a hill at the Franz-Marc Museum is between you the train station in Kochel! Have fun!

To make things easier the route I elaborated contains much street parts, but there you mostly got bicycle paths so you can bike without fearing to get blasted off the road. So here is the detailed route I can highly recommend.
If you are a more professional biker than I am, you can add many nice and challenging detours – send me your propositions!
To go from Munich to Lenggries and from Kochel back to Munich, I recommend the Bayern ticket for 25 € and additional 6 € for anyone who joins you. Sorry there is no good english version that ticket. Oh, and you will need a bike ticket for 5 or 6 €!