Altmuhltal Nature Park

Altmuhltal Natural Park is the largest nature park in Germany. It covers the area of 2900 sq km. Though it covers some of Bavaria's loveliest lands, but it's relatively undiscovered by Non-Germans.
You can even explore the Altmuhltal Natural Park by yourself. They have hiking and biking trails so you can enjoy the park by biking or hiking or just explore the park with canoe facilities. You can either take canoe for one hour or for the whole day. Camping facilities are also available.