The Krickenbecker See is wonderful to walk around or cycle around. Here and there are the small paths to the fishing piers, which give charming views of the lake.
It's a great tour. For one, it is very scenic and on the other hand, it has here and there to offer ups and downs (which is the otherwise flat Lower Rhine) not so common. An absolute treat.
Castle Arcen is located close to De Maasduinen National Park. The stately country house has a double canal and can be visited for a fee. The castle gardens are especially recommended.