Airports - Hartsfield International (ATL)
Train - The rail system is readilly accessible from the airport and a short 20 min ride right to the heart of downtown.
Bus - Never had the opportunity or the need although they are present and seemed readily accessible
Auto - Parking is readily available on the street and on in a few decks. Traffic is light downtown.

Downtown - Downtown you'll find "The Bucket" the local mall and restaurant district. Although, it isn't really marked as such, it's hard to miss. As soon as your begin walking through the sky ways or to and from the train you'll find your self smack in the middle.