This river line operates approximately two dozen comfortable, classy, well-designed ships in Europe, Asia, Africa, and the Amazon for a mostly age 55-plus crowd. Avalon Waterways gets props for good tours (it organizes everything; no need for a guidebook) and creative special interest cruises — on topics including golf, wellness, wine, and beer. The fleet, with ships holding between 36 and 140 passengers each, includes two "Suite" classes where the majority of cabins are 200 square feet or larger and have beds facing sliding glass doors.