The most stable part of the ship is its lowest point of gravity, so on a lower deck, at the center. You'd feel a lot less motion here than, say, in a stateroom on the upper decks a long way forward or aft (towards the back of the ship).

Note too, that cabin numbers are the same either side of the ship, they are not odd or even -- the letter A is Port side, Z is starboard (this is a nod to airline configuration). There are no key cards; Virgin uses wearable tech that opens your door and pays your bills.

"It's for the young at heart, is how we think about it." Virgin Voyages vice president of North American sales John Diorio said the line's target market is "anyone going on vacation without kids." While the average age of guests is 48 to 49, he said the target demographic is 34 to 62.