Launched in 2011 by AmaWaterways, the 124-passenger AmaLotus runs Mekong River itineraries year-round between Vietnam and Cambodia. On board, guests can anticipate spacious (from 226 square feet), Asian-inspired staterooms and public spaces, all designed to maximize the passing riverbank views (almost all of the cabins have true balconies). Look, too, for a restaurant serving Asian and Western fare, a duo of lounges, and a small fitness room, salon, and spa. Bonus: The expansive sun deck touts a small swimming pool and bar.