The Atlanta Beltline is a network of redeveloped railway lines that connect some of the coolest neighborhoods and parks in the city. The Eastside Trail especially has plenty of spots to grab a quick snack or drink and is a fun, low-key way to explore the city in between wedding festivities. One of Alison and Kevin's absolute favorite things to do is grab a cocktail at the Beltline Kroger Bar (trust them) - it overlooks the trail and makes for excellent people watching. They also recommend a stop at The Victorian - a local plant shop.
Even though it's a crowd-magnet on the weekends, Ponce City Market is a must-visit while you're in Atlanta. When Alison and Kevin first started dating, Alison lived within walking distance of PCM which was the locale of many of their first dates; and, where Kevin became a plant-head (of the house variety). You absolutely must grab a slice from Pizza Jean's while you're there - Alison recommends the Cacio e Pepe Pie.