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Someone who knows Atlanta will not usually think of downtown - where the conference hotel is located - when they think of good places to eat, or locations to visit. You're better off going elsewhere, and that probably means using MARTA, the Atlanta subway system. Happily, the neighborhoods with some of the best, walkable options are within 15 minutes of downtown by MARTA. The two MARTA-accessible areas to focus on are Decatur and Midtown.The The nearest MARTA stop to the hotel is Peachtree Center. A few stops north and you'll be in Midtown. If you go one stop South (Five Points station) you'll be able to switch to a train running eastward to Decatur, 6 stops away.
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