Maybe this has been done before (probably has)...but, if you had a chance to experience a video game world first hand, like live in it or just visit, which would you pick?

I would go with the Mario universe, just so I can visit Island Delfino. That place looks like total paradise. Racing in the Mario KArt tracks wouldn't hurt either.

On the other hand, my wife would like to live in Animal Crossing just because it's cool to live next to animals (that don't attack you) and not have to clean up after them. Also, moving around furniture would be easy, just pack a leaf.

My son would like to fly missions next to fox McCloud.

Guess to each his/her own.