Flying to a Party (and back)

I'm trying to make plans for 2012, and just in case the Mayans were actually right I want to get in as much partying as I can. That means there are two logical choices - New Orleans for Mardi Gras or Brazil for Carnivale. Would like to do both but if the world doesn't end then my liver and bank account wouldn't be able to handle that. The crux of the flylemma is that Brazil takes longer to get to, but it has much more beautiful beaches and people. If you were me, or even if you were you, where would you go?

I would also appreciate advice about which airline to take. Price is important, but smoothness of ride is also essential considering the likely hangover after days of debauchery.