3scenic
Rüdesheim sits at the mouth of the most castle-dense stretch of river on earth, and this round-trip from the town quay is the no-transfer way to see it. In about 90 minutes you sail past Burg Rheinstein and Burg Reichenstein on their crags, the romantic Ehrenfels ruin in the vineyards, and the storybook Mäuseturm (Mouse Tower) marooned on its little island. It is the exact 'Rhine castles' image a first-timer pictures, and the boat leaves steps from the ship.
Who to callBingen-Rüdesheimer Schifffahrtsgesellschaft mbH~EUR 20 (~$22) adult for the ~90-minute castle round trip from the Rüdesheim landing; book at the quay or via the operator site
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Beats the shipDirect wins on price and flexibility. Lines bundle a scenic Rhine-gorge boat segment into the day or sell a short version in the $30-60 range; the local Bingen-Rüdesheimer Burgenfahrt is ~$22 and departs right by the dock. Note this is a short castle loop, not the longer Loreley run, so if your itinerary already cruises the gorge under sail, you may not need it.
What to expect, timing & how to book →