In general, my impression of a place is more determined by the people I happen to meet, rather than the place itself. Like, a beautiful place still isn't great if you're not around nice people. And a pretty horrible place is still a lot of fun with the right person! :)
With that said, I think I liked Brazil the most. Beautiful nature, great people, awesome language. I like all of South America though. And the Philippines. Anywhere with a hot sun shining on me. :D