If you like hiking, and if the weather is nice, check out the Neanderthal, just outside Düsseldorf. You take the S28 direction Mettmann Stadtwald and get off at "Neanderthal", or the S8 direction Wuppertal and get off at "Hagen" I think, anyway, it's the second stop after Gerresheim.
They also have a prehistoric museum there. Other than that, of course you don't see much any more that indicates this is the place where some of the first humans lived. But still - it would be a pity to be so close to that place and miss it.
Walk the Graf Berger Wald. Excellent hiking! Run along the Rhine, both sides. This has exceptional scenery.
I agree that Duesseldorf is not great for cultural stuff. It developed late. The MediaHafen would be an interesting place to run. Some great buildings with nice views of the Rhine. Also the extension of the Koenigsallee is impressive. The two art museums are pretty good, but on the 2nd tier as museums in Germany go. I bet there are paths along the Rhine going north that are nice. But don't know.
For the 'Must See's' I definitely recommend to take a look at this site:
And yes, don't expect London, Paris or Berlin for sightseeing - compared to this, Duesseldorf is rather small - but very beautiful and enjoyable. You will love the sights like the Media Harbor, Koenigsallee, Altstadt, Castle of Benrath, etc.
But also the remote places like for example the Neandertal will surely cover your needs and interests.
Enjoy the trip to Duesseldorf!
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