We spent a whirlwind day in Atlanta while traveling from Utah back to Florida. It's not necessarily a place we would have made a destination, but we didn't have any trouble finding things to do.
We stayed right downtown, which enabled us to take a CNN studio tour, visit the Martin Luther King Jr. National Historic Site, play in Centennial Olympic Park, check out the World of Coca-Cola and make a (very) quick pass through the Georgia Aquarium.