Oceania has carved out a niche with relatively small, upscale ships that offer a significant upgrade from mass-market vessels but aren’t quite as fancy (or pricey) as luxury offerings. Its six ships feature a relaxed, country club-like ambiance and inspired dining that appeals to a mostly older crowd. Itinerary-wise, Oceania is known for destination-intensive voyages that typically are 10 nights or more in length, with some globe-circling trips as long as 180 days.