What Is Your Favorite Spanish-Speaking Country?

I have the opportunity to spend a week or so traveling in the very near future, and I’m pondering where it is I should go.  I haven’t been to a Spanish-speaking country in a while now, so a quick visit, even if it’s only for a few days, would be a great way to brush up on my Spanish skills.  I have traveled to several Spanish-speaking countries in the past, but so far my favorite has been Spain.  For my upcoming trip, I’d like to go someplace warm (I’m freezing the last few days) so I’ve narrowed it down to:

• Puerto Rico (okay technically a commonwealth, but still)
• Dominican Republic
• Costa Rica
• Mexico (on the beach somewhere)

Costa Rica would be my hands-down favorite but for the recent natural disaster there.  Now may not be the best time to play tourist.  Similarly, I don’t want to spend more than 5 hours or so on a plane (I live in Atlanta) so anything too deep into South America is probably not realistic for this particular trip.  Does anybody have any other suggestions for Spanish-speaking locations they think I should visit within a 5 hour flight from Atlanta?