Hong Kong & Okinawa, five nights at sea

Built for one and priced for one, without the single supplement that otherwise makes a solo booking cost close to two fares. No window, and small even by interior standards. It is much the cheapest way to sail alone on this ship. There are very few of them, they sell early, and none will take a second guest.

No window at all, and the cheapest way for two people to sail. Completely dark with the lights off, which some sleep better in and others find disorienting. Connecting pairs are sold as their own category and are worth asking about for two cabins travelling together. On a ship this size the walk out to daylight is long enough to matter.

An interior cabin with a floor-to-ceiling screen showing a live feed from a camera on the bow or the side. It gives you the time of day and the weather without paying for glass, and suits anyone who dislikes waking with no idea whether it is morning. It is a screen, not a view, and most people switch it off at night.

A sealed window, generally on a lower deck, and the cheapest way to have real daylight and a horizon - which matters more than it sounds if anyone in the party is prone to seasickness. A slightly larger Spacious Ocean View is sold alongside it. There are far fewer of these than balconies, so the choice of position is narrow.

The same single-occupancy deal with daylight and a real balcony, which is unusual - most ships that sell solo cabins sell them windowless. It suits someone travelling alone who wants outdoor space and will not pay a double fare for it. Still small, still strictly one person, and dearer than one share of a balcony cabin booked by two.

Private outdoor space, and much the most common cabin on board. Royal Caribbean sells four variants of it - obstructed, connecting, standard and one with a larger balcony - and the obstructed ones look onto a lifeboat or a structure rather than clear sea. The upgrade most people are glad of on sea days, and less compelling on a port-heavy run.

More floor area, a proper sitting area, a bath as well as a shower and a larger balcony. The thing to know is that it sits outside the Suite Club, so it buys the space and almost none of the privileges - no private restaurant, no suite lounge, no concierge. Judge it as a large balcony cabin rather than as a suite.

Spectrum's suites-only enclave, and the thing that most separates this ship from its Quantum-class half-sisters. Royal Caribbean describes it as private dining rooms, lounges and an upscale Solarium, with a private sun deck called The Balcony for Sky and Star guests. Grades run from a Sky Junior Suite through Grand and Owner's Suites to a loft. Suites carry a higher daily gratuity.

A multi-room suite built around children: Royal Caribbean's own copy names an in-suite slide and a private cinema that doubles as a karaoke room. It sleeps a large family and is the most expensive room on the ship by a wide margin, several times the next suite down. Worth naming to a family who would otherwise not think to ask, and to nobody else.