Over the years this has been discussed several times in the AdSense forum with no firm conclusion!
I did live on the Gold Coast in Australia for a while, that was excellent, and I must admit I've always fancied New Zealand but never got there.
Lived in Italy for a couple of years on the Apuanian Riveria, fantastic food and lovely people however quite expensive these days.
I've always fancied trying north west Spain, the Galicia region, or maybe Portugal. Property can be bought at much lower prices than they used to be in Spain. Abu Dhabi is much nicer than Dubai if you fancy a modern city.
The UK has quite a few advantages but does not match your non-nuclear request. One of my favourite places is the coastal city of Xiamen in China but can be a bit wet in the season!
Both Croatia and Albania have stunning scenery but you have to be careful where you locate to for good Net access...all in all there are quite a few places on my list which is getting shorter these days since I don't like anywhere with high humidity:-(