On our travels we took several day cruises on the Rhine, which starts in Koblenz. The last stop on the KD ship (Köln-Düsseldorf, the Goethe ship) is Rüdesheim.
I highly recommend to buy a Guide Book for Germany. It helped me in the past to discover places I would’ve never thought of. My recommendation:
Rüdesheim is surrounded by the Rheingau wine mountains and a gateway to the upper Middle Rhine Valley. The district Assmannshausen is already a World Heritage Site.
The famous alley is the Drosselgasse, it’s only 2 meters wide and 144 meters long. It is walked by three Million people/tourists a year. There a mainly Wine restaurants, gift and souvenir shops