A game world that if you could, that you would take your significent other? There are plenty of world out there. Beautifully designed worlds like FFVIII, like the Mushroom Kingdom.

Mine would have to be any of the FF worlds, Liberty City(as long as I could be someone else and not "Fighter") or my Sims world. In my Sims world, I'm rich. My house is huge! I've got all the cool shit and my lady would definately be pleased.