A world like James Cameron's Avatar
A world exactly like this one where I had godlike power.
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This is a hard question. Man...I'd want to live in a world where I could be a Red Mage...or just any kind of mage. But then, I think I'd be recruited to stop some evil, powerful war-lord from taking over the world and destroying all the crystals, so maybe not...
a disco world where every1 parties all the time
A world where all my fantasies become true.
(So I can have powers, steal a train, hit Bush in the face and fuck Natalie Portman and Olivia Wilde at the same time).
A world where magical creatures existed (the phoenix, pegasus, griffin, elves, dragons etc) and there wasn't a lot of technology, but it's magical substitutes for some of the really important inventions, where you could use magic (that's obvious after my previous point), and it was sunny most of the time in most places. Where there were swords(any kind, traditional, lasers or light sabers) and all that stuff. I guess that's about it.
You know what would suck of a medieval or less technology world... toilets.
A world where everyone speaks the same language and all conflicts are settled through either kung-fu or baseball. Or both at the same time.
Kung-Fu-Baseball sounds like an epic game. I'd certainly watch it.