The Royal Yacht Britannia was the royal family's private yacht from 1953 to 1997. The luxurious cruise ship is now a public museum.

For instance, at the time of this writing, one Norwegian Cruise Line trip to the Caribbean has an inside room for around $200 less than an ocean-view room and almost $500 less than a balcony room.

The cruise line also keeps an eye on industry trends and “what’s motivating people to travel these days.” Grigsby cited astrotourism, for example, which has shown up in itineraries designed ...

Still, some cruise ship interior cabins are better than others. Several of the best inside staterooms feature additional floor space, making them roomy enough for a family of four. Meanwhile ...