[gamma_girl52]

As an Atlantan myself (but not native like 90% of people living in Atlanta, LOL) I would agree with the places WarEagle07 described.
The new World of Coke is open now, has been for a few months. I hear it's nice. The Aquarium is awesome as well. Be prepared to pay about $20-something for a ticket but it's worth it.
The CNN Center tours are nice as well. And visit Centennial Olympic Park across the street. However the fountains are off for the year...but still very nice.
The great thing about the "A" is that there are lots of good places to eat--there's something for everybody. I personally don't like the food at the Varsity, but it is an experience to be had if you visit. Some people love it. I think I'm in the minority.