The Isar river runs through the middle of Munich. Along the east side of the river you will find miles of trails that run down the river. I rode from the Munich Hauptbahnhof (central train station) to the river in about 10 minutes. Then I took the river all the way down past Grunewald about as far south as Starnberg before turning around.
Location:
Munich, Germany
Directions:
From the Hauptbahnhof, follow Siedlstraße down south, and eventually bends east and comes to the river. Hop on the river headning south, on the east bank.
Low. This is the Munich equivalent of the hike and bike trail with a little Walnut Creek added. However, there are some very technical dirt jumps and other features off on the side. Based on the fact that I had a crappy rental bike, these were not an option.
Length:
Depending on how you count it, there have to be 20+ miles. Not sure how far they extend down, but they seemed to go on forever. It is an out and back.
Trails:
Flat, dirt trails. Not much elevation to speak of.