The Danube River is free to visit 24 hours ... For a list of available boat tours, visit Viator's website. Budapest Evening Sightseeing Cruise and Unlimited Proseccos (2488 reviews) ...

For the first time in more than two decades, cruisers will have a new river ... Budapest, Vienna, and the Bavarian city of Regensburg in Germany, where passengers can opt either for escorted tours ...