Don't carry inside a church
Don't carry inside a school of any kind
Don't carry to a sporting event
Don't carry to a concert
Don't carry to a bar (restaurant is fine, just don't drink)
Don't carry in government buildings
Don't carry to a political rally of any kind
No signage laws so signs mean nothing. Just leave if asked to leave
Don't carry on MARTA (public transport) unless you are prepared for a legal battle. It's legal but they are jumpy as hell about it.
Some of the lakes and parks in Georgia are run by the Army Corps of Engineers. These areas are on the federal list of prohibited places for armed citizens. Lake Lanier and Red Top Mountain State Park are two such examples. Be careful to avoid any US Army CoE managed areas in Georgia while armed.