Minecraft! Oooohhhhh, I tell you what that Minecraft world would just be so much fun! Nah, I'm simply jesting!
More than likely I would go with type of mmo, you name it and I think it would be an interesting place to live if you could! I've always been a big fan of mmo's and have been playing WoW since Vanilla. Sadly I have recently quit WoW, but I am now on a journey to find a new good mmo!