South Carolina has a lot of interesting and beautiful places to visit. Start with a search of "historic sites in SC".
Georgia has a number of historic sites and state parks, the Savannah area is a good choice, especially
Ft. McAllister State Park just south of Savannah. They often have re-enactments there. You can camp there and use it as a base for exploring the area. Wormsloe Historic Site with an oak avenue is on the edge of Savannah.
St. Augustine, FL is another good historic area to visit. Tarpon Springs FL on the west coast has a Greek community there with a beautiful Greek Orthodox church to visit.
Come back north on I-75 on your way home and check out the Aviation Museum at Robins AFB in Warner Robins GA. It's one of my faves. Free admission and free parking. They have an SR-71A Blackbird on display there that still holds the airspeed record. You can get information for planning your visit
at this link. It's just south of Macon GA.
Atlanta traffic and urban sprawl is bad. If you can try going around it as in far outside their beltway. There are a lot of interesting historic places to visit away from the urban mess. I recommend shooting on over to Alabama with its Talladega Speedway and then head home via Chattanooga TN. Plenty to see in Chattanooga and you can even visit Rock City for an old time kind of vacay with interesting things to do.
Enjoy your trip.