Check out Centennial Olympic Park. You can park your car and take a nice walk around the area.
http://www.centennialpark.com/
The Buckhead District is very nice; a lot of restaurants, bars and nightlife. The area of Buckhead itself is very upscale. If you like to drive around and look at homes, there are some gorgeous estates to drool over here.
http://www.buckhead.org/
Stone Moutain Park is 16 miles east of downtown Atlanta:
http://www.stonemountainpark.com/newsite/parkinfo.asp
The Varsity - It's a well known dining establishment (casual fast food):
http://www.thevarsity.com/