It depends, each country has something to offer. I really like to go somewhere where you just don't expect something/you have completely wrong picture about it. Just nice surprise every time you travel there. Also for travel it has to have the "I want to go there" factor, when I say to someone that USA is for me no go country because of this they usually don't understand.
I would like to travel across the Europe, each country is interesting, even Russia (but visit Russia before Russia visits you and I just don't want to go there now).
From Asia there are few interesting countries, Taiwan and South Korea.
On Africa I just don't know, certainly I would like to go to Morocco, but some other countries there are on the list.
Australia and New Zealand are also high on the "I want to go there" index.
America's - Canada, Mexico and Argentina
For living I just don't know.