Hotel
The Hyatt Place is located minutes from the Georgia Aquarium. Follow the link above for the group rate discount.
Discount Code - https://www.hyatt.com/en-US/group-booking/ATLZT/G-GAAG
Flight
Hartsfield-Jackson is the primary airport in Atlanta. This is highly recommended if you are flying into Georgia.
Train
Marta is the primary shuttle/train use to get from the airport to locations/areas in the city of Atlanta. I also recommend Uber or Lyft services as well.