The Danube River cruise, for instance, takes you through multiple countries, from Germany to Hungary. You can visit cities like Vienna, Budapest, and Bratislava. In Vienna, you can attend classical music concerts, visit imperial palaces, and sample Viennese pastries. The boat's architecture often blends with the local style, giving you a more immersive experience. However, docking at different ports can sometimes be delayed due to river traffic. Onboard, you'll find elegant restaurants serving European delicacies and fine wines.

The Rhine River cruise is known for its stunning castles. You can see medieval fortresses perched on hills, surrounded by vineyards. Some cruises offer wine-tasting sessions, where you can sample local wines. But, the prices of these tastings can vary. The scenic views from the cruise are breathtaking, especially when passing through the Rhine Gorge. There are also opportunities for shore excursions, like hiking in the Black Forest or visiting ancient cathedrals. But, make sure to plan your time carefully as there are many attractions to see.

The Seine River cruise in France allows you to see the Eiffel Tower, Louvre, and Notre-Dame (restoration work notwithstanding). You can explore Paris at your own pace during shore excursions. The onboard facilities are top-notch, with modern amenities and cozy lounges. The cruise also offers guided tours of Parisian art and history. But, navigating through the locks on the Seine can be a bit slow, which might affect the overall pace of the journey. You can relax on the sundeck and soak up the Parisian sun while enjoying the views.

European riverboat cruises provide a comprehensive cultural and scenic experience. They offer a more intimate and leisurely way to explore Europe compared to other forms of travel. Just be mindful of language barriers and currency exchange, as you'll be visiting different countries.