What sort of shots are you going for? There's some great spots outside the con inbetween the Embassy and Marriott hotels, and the hotels themselves tend to have pretty lobby areas you could use too.
There's the dock areas on the first floor outside on the back side of the con you could use, and the far left side of the convention on the second floor (closer to the bay area) you could use if you want to stay inside and it's usually not crowded over there as the main events are on the right side (usually, I think it's the same setup this year).
These are locations I normally use off the top of my head, but I'm sure there's more places if you take the time to scout around
EDIT: And lawl, I just realize we've spoken through email recently lol, hi.
Cons in 2013:
Anime Weekend Atlanta
Costumes for 2013:
Apollo Justice | Ace Attorney | 100%
Yukio Okumura | Ao No Exorcist | 95%
Hazama | Blazblue | 98%
Shinji Ikari | Neon Genesis Evangelion | 100%
Alexei Denoia | Tales of Vesperia | 80%
Leia Rolando | Tales of Xillia | 100% (Xillia 1), 15% (Xillia 2)
Jiland/Gilland | Tales of Xillia | 90%