As the name suggests, Scenic Tsar cruises Russia's rivers, with 15-day itineraries from St. Petersburg to Moscow or vice versa. Every trip includes multiple nights in both of the cities as well as a five-night cruise, visiting plenty of small cities in between the major metropolises.
The vessel itself underwent a thorough reconstruction in 2012 to fit requirements for luxury line Scenic, and feels like a whole new build. (The basic framework is all that remains from before the renovation.) It is one of the smaller ships used by the line, though, carrying just 112 guests and the crew of 71 means lots of individual attention.