6-day trip, starting from Dusseldorf, Germany, itinerary, please design

It depends on which direction you go. 6 days is not much time and you can’t go to many places.

Northwest: Dusseldorf-Rotterdam-The Hague-Utrecht-Amsterdam; Southwest: Dusseldorf-Antwerp-Brussels-Ghent-Bruges-Paris; Northeast: Dusseldorf Husband-Hannover-Hamburg-Berlin; Southeast direction: Dusseldorf-Cologne-Bonn-Frankfurt-Heidelberg-Stuttgart-Munich;