If you are looking for a great sports bar with plenty of Flat Screen TV's to watch your game check out Stats downtown or Hudson Grille with three locations throughout Atlanta (Brookhaven, Midtown and Sandy Springs).
If you want a perfect pint of ale at an authentic Irish Pub check out Meehan's Public House with four locations around the city (Atlantic Station-Midtown, Downtown, Vinings and Sandy Springs) or Fado Irish Pub in Buckhead. These Irish Pubs don't serve your typical bar food but bona fide Irish far. Once you are inside either Pub you will feel like you have been transported back to Ireland.
If a Martini is more your speed check out Beluga Martini Bar in Buckhead. This unique location has an atmosphere for someone in their 20's to 50's. If you are staying downtown go see Mingles which has a glamorous LA and Miami scene but with a Southern hospitality. If you are closer to the Perimeter area go see the Platinum Blue sushi and martini bar. They offer so many different martini you will have a hard time deciding.
If you have your dance shoes on and you want to party all night check out one of the many Dance Clubs in Atlanta. Buckhead has several like Tongue & Grove and the Havana Club. Tongue & Grove has an 8,600 square foot lounge which rivals other world-class nightclubs. The Havana Club has been featured by Maxim magazine and hosted a Captain Morgan birthday party. Midtown and Downtown have over six nightclubs to choose from which offer something for anyone. Check out Compound, CosmoLava, Magic City, Opera or the Tabernacle. If Salsa dancing is your thing go see one of these clubs, Latin Sol, Loca Luna or La Rumba 2.