Catch a ferry up and down the Rhine. The trips vary in length, the longest going all the way to Dusseldorf. But even on the shortest voyage available, I found boating on such a mighty and iconic river well worth the few euros.
Another good view of the river can be found by walking along the bank opposite the old town. There's a wide flood plain that offers the opportunity for a peaceful riverside hike that lasts for a good couple of miles.
Catch ferries from the wharf near the Old Town.
www.k-d.de/englisch/
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