Pokemon would be a good one, but I can't imagine living in that world. I know what I would do though: Go on a quest to catch meowth, and then live the easy life forever using payday and leveling in a ton.
Yu Gi Oh would be another awesome one: Basically real life with holographic monsters. And because I'm not the reincarnation of an ancient egyptian soul, and suck ass at duelling, I would never be sent to the shadow realm.
Another decent one would be Roller-coaster Tycoon. Design my own amusement park? Oh hell yes. Madness: The Car Racing Game would be crazy fun in a kind of terrifying way. Out of those four, I can't pick, but I know I wouldn't pick Madness. Honestly, I'm not a big fan of fighting of any kind, so most games don't really appeal to me for real life.