ResidenSea
The World: Three-Bedroom Apartments

These suites really could be apartments. And not just any run-of-the-mill condo in Florida, either: We're talking a renovated beauty you'd find in a prewar building on Park Avenue (all the surrounding water and gentle swaying notwithstanding). Picture recessed lighting, crown molding, and wood paneling, as well as built-in bookcases and striped wallpaper. With three bedrooms and three bathrooms, and totaling 3,242 square feet, these spaces cry out for three couples who like each other—especially considering that there is also a large terrace and a Jacuzzi tub. Hopefully one of you is a gourmet chef, as many of these apartments have spectacular kitchens with Viking ranges and Sub-Zero fridges, and are stocked with so much equipment that it would put Top Chef's setup to shame. (Kitchen amenities vary, though, so ask when booking.) Groceries are delivered from Fredy's Deli onboard or from local markets in port.

Best detail: The World's operations are more akin to a floating condo time-share than they are to a cruise ship. While the vessel's got cruise-ship amenities like a Banyan Tree spa and a full gym, the majority of cabins are individually owned, and rented out to passengers when not in use. Owners have a say in the itineraries, and the ship often makes for ports hosting major events, such as Monaco's Grand Prix, Carnaval in Rio de Janeiro, and Valencia's America's Cup.

Set sail: Summer and winter, Europe

ResidenSea
Tel: 954 538 8400
Three-bedroom apartments from $3,000 per night, with a six-night minimum

NEXT: A return to elegance >