This small Oceania ship packs a lot of style, from the decor to the activities. Design choices — including suites styled by Ralph Lauren and a Lalique staircase in the grand foyer — are sophisticated and elegant. The Canyon Ranch SpaClub, the best brand on the high seas, has a gorgeous outdoor hot tub. And the 1,250-passenger Oceania Riviera sails with an Artist Loft, where artists-in-residence teach classes in painting or photography on sea days to guests eager to commemorate their trip with what just may be the best cruise souvenir ever.