I've been to Atlanta a couple of times, but unfortunately I don't have much advice about what fun things there are to do there. Just the usual: CNN world headquarters, the Georgia Aquarium, and the "World of Coca-Cola" Museum are all walkable from the conference hotel. If you like baseball, which you should, you could take a tour of Turner Field (which all right-thinking people think of as Hank Aaron Stadium), but that's not at all close to the hotel. And the Falcons will be playing the Buccaneers on Sunday at the Georgia Dome. But other than that, I'm not sure what to suggest. I'm not aware of any attractions of any real historical or cultural significance. And as I understand it, the "Downtown" area shuts down pretty early and doesn't have any kind of nightlife--though I'd be happy to hear that I'm wrong about this.
What say you, Smokers? What should conference-goers not miss while in ATL?