We recently went on a family vacation to Atlanta, Georgia and had a wonderful time.  Our kids are 12, 9 and 3 so planning family trips can be a challenge to interest all age groups.  The city has everything you could ask for:  an incredible aquarium, a great zoo, plus a wide range of museums, from CocaCola to Natural History.  We had an easy time getting around, and using the CityPass made it all very reasonable.