The Dominican Republic.
I visited this country for some winter sun at the end of last year. My wife booked us into an all-inclusive beach resort which was lovely but we didn't really see any of the country. I spent a lot of time reading about the history of the place, which is fascinating.
Here's a recent article and slideshow from the New York Times about the border between the Dominican Republic and Haiti.
You can see some of the pictures I took by clicking on the links below.
Punta Cana part one
Punta Cana part two