A Culture of Plenty
The Culture civilization, of which the ship is a part, has no need for either laws or money. Hyper-intelligent Minds run the ships, orbitals, and other non-planet Culture worlds, keeping the citizens safe and happy. The SAMWAF is just one of many such ships, and as a GSV Mind, it is always happy to help; clothing, living space, information, recommendations, all are easily provided to anyone who asks. As the Culture adage goes, money is a sign of poverty, and there is no poverty to be found anywhere onboard. The only rule is that you mustn't harm other passengers against their will. Rule-breakers will be stopped by a ship drone, then chaperoned by the drone thereafter to ensure their wanderings don't involve any more violence.

A Paradise Ship
The SAMWAF is a Plate-class GSV, nearly 100 kilometres tip-to-tip when measuring its outer field structure, four kilometres high naked hull. It has a population of roughly one fifth of a billion people, and about ten thousand named ships currently docked, including two smaller GSVs that contain populations and shipyards of their own. The human-habitation portion of the ship takes up 50 by 20 kilometres across, and a solid kilometre of the ship’s depth. Luxurious underground rapid transit allows quick access to all parts of the ship. Above, a glowing, yellow-white line traverses the sky in place of a sun over the course of the day.

Demographics
Most residents of the ship are panhuman—that is, roughly human in appearance, but varied in evolutionary origin. People may have different numbers of fingers or joints, strange proportions, weird skin colours, missing nipples, fur, or other unusual traits. They may have augmented their bodies with grafted-on horns, laser-tattoos, or other whimsical alterations. There are also plenty of drones floating about—sapient robots that generally look like little floating briefcases. Coloured aura fields around them flash to display their emotions while they chat. And, of course, though a minority, there are aliens from all parts of the galaxy, with all the diversity and strangeness that implies.

Example Locations
Divinity In Extremis is described as a semi-regular social event, performance space and drug bar. It is on the wilder, less reputable side of gathering places within the ship, and everything from orgies to nude swordfights can be found within. Loud music throbs through the space, interspersed with areas of quiet created by faintly-glowing sound fields. Ship avatars are known to spend time there.

You can go body-surfing in a great, half-dark hall overlooked by bars and party spaces. The hall itself contains a great curved slope of upward-charging water, down which people are encouraged to throw themselves, be it on their front, their back, or (if they're coordinated enough) on their feet.

The war porn bar hiding the Dreamer Shard is housed within a stubby, worn-looking ship called the Hidden Income in one of the SAMWAF’s smallbays. It is a private bar, and a small drone floats outside to vet attendees. Another of the Hidden Income’s drones will escort guests inside to a dim space lit only by screens and holos, and sheets of finely-ground lead falling from slots in the ceiling. The amphoteric lead fills the space with a flickering orange glow, a sticky heat, and a strange, bitter smell. Large round tables sit scattered about, around which people sit or lounge with drinks, drugs, and food. At the centre of each table is a number of screens or a holo-display, displaying grisly scenes of warfare from planets around the galaxy.

GSV fan art (source)