5. Britannia Single Staterooms on Cunard

Britain’s legendary Cunard line clearly knows what its travelers desire — and delivers with tons of ocean-view cabins for one. On both Queen Victoria and Queen Elizabeth there are nine solo cabins (eight outside and one inside). And the location can’t be beat: They’re right near the Queens Room ballroom, a buzzing social hub, and the Royal Court Theatre. As of July 2016, the transatlantic Queen Mary 2 will have 15 ocean-view cabins for solo travelers, located midship on Deck 2 and Deck 3. All the line's single cabins are in Britannia class and are sized from 159 to 162 square feet.