Chattahoochee Nature Center at 9135 Willeo Road, Roswell, Georgia.

What a great place for young kids. Lots of animals, turtles, birds, trials super fun activities, great staff. The city is right there so you don't have long to travel. Roswell and Sandy Springs are just next door. Bring a lunch, and I also suggest a bottle of water. Seems like a safe place, but can get a little crowded. It was $10 to get in, our little one being free. They even brought out the hawk at one point.