Dümmer nature discovery trail Walk through the landscape of Dümmer See and enjoy the unique views. Read all about the surroundings on the information signs along the trail and don’t forget the observation towers. Dümmer See Sailing Paradise Enter a true sailing paradise on the Dümmer See lake. Enjoy the open water, various sailing competitions and events. First time wind sailing? There are plenty of sailing schools! Dümmer Nature Park Walk and cycle with the whole family through the forests and marshes of the nature park. Brave the rivers, discover the numerous varieties of plants and animals, and naturally all kinds of birds.