Italy sounds like a good spot to me especially mid summer. Good quality food, good weather and good kitesurfing!.
The East and West coasts of the states sound good too.
I'm beginning to sense a common thread here

Northern Italy sounds awesome, but might pose a problem for some Americans (like me) who have to make due with a tanking currency. I would imagine exchange rates would be crappy. That being said, Europeans would probably have more purchasing power here as their national monies seem to be stronger. I read some articles a while back saying that New Yorker businesses no longer exchange their euros and pounds for dollars because the favorable exchange rates (to Europeans) has led to a boom in tourism, and they just trade their foreign currencies back to the tourists.
So ... maybe New York (state) as a focal point? This might make the trips longer for Australians, but most everyone else could get there easily. Just a consideration ...