It is forbidden to: start and maintain an open fire, not even for barbecuing; to smoke (from beginning of March to end of October); to camp; to leave garbage behind; to use motorised vehicles on the paths without permit. Transgressions will be prosecuted and carry fines of up to 10,000 German Marks.
One Word Picture Challenge asked for manual. Some forests, apparently, come with a manual. Other interpretations of the word can be found here.