What was life like on the Ark before it go flooded with refugees? Was the Ark self-suffcient? Did they grow thier own food, have a ranch, or have everything flown in? What did they do for entertainment? How did they determine who got on the Ark in the first place? What did the housing look like? Why did the Ark lose contact with the rest of the world?
The Ark was originally a five-star, top-of-the-line resort. The Security, at the time, simply had the role of protecting celebrities who were vacationing on the Ark. Entertainment wouldn't have been much different: hanging out at the beach, watching movies, etc.
Originally the Ark was designed to hold around five thousand survivors in the event of an international catastrophe, so it should be self-sufficient. Unfortunately, this international catastrophe did happen, and the Ark is the only known surviving place as of our current standpoint. There really was no determining how people could get on the Ark: if they lived and found the Ark, then they lived and found the Ark. If they didn't, they would be dead at sea.
If only five thousand people were supposed to live on the Ark, then the houses should be very comfortable and large. Of course, due to the massive influx of people on the Ark, some live extravagantly (the Founders), while some live in extreme penury (Container City favelas).