The State Botanical Garden of Georgia in Athens has something for everyone. With the tropical conservatory, formal garden, international garden, native garden, and food garden, there are favorites to explore no matter the type of garden you love, and hikers will find miles of forest trails. If you have your kids in tow, plan to stay for hours in the amazing wooded play area. Associated with the University of Georgia, this ever-changing experience is a lovely place to visit over and over again.
Take a two hour drive southeast from Atlanta to drive to the Warner Robins Air Force Base to visit an amazing, 51 acre aviation museum. It's free. It's big with four large buildings full of aircraft. It's beautifully done. Experience history lessons while pulling kids in with airplanes, helicopters, uniforms, weapons, and great educational displays. You won't be able to see it all in one day, so just start planning on your second trip.