Emerald Waterways is a newcomer to the river cruise industry and has already made a splash with its fleet of sleek ships showcasing a classy yet casual vibe. The 92-cabin Emerald Star — one of five vessels in the line's Star-Ship class — plies Europe’s Danube and Rhine rivers. Similar to many cruise lines, it has an all-inclusive pricing model that bundles in airport-to-ship transfers; beer, wine, and soft drinks at lunch and dinner; staff gratuities; and guided land excursions — making a trip aboard the Emerald Star a no-fuss, no finger-lifting vacation that covers a lot of ground, including gorgeous scenery and historical and cultural sights.