If you REALLY like Coke. :) It's a little gimmicky, but it's fun. Price: 17 for adults, 15 for seniors (sorry, Lil, not you.)
This is so close to the World of Coke! Everything is sort of walking distance around there. Also, there are great seahorses and a tide pool you can stick your hand in. Price: 32.95 (which is ridiculous, but there are seahorses, so)
The Fernbank has all kinds of cool natural history exhibits! Price: 20
This is a lovely park to walk around in. The surrounding area is nice, too. Price: it's a park.
This is not a park so much as a neighborhood. There's a tea shop (Dr Bombay's Underwater Tea Party) that we highly recommend, as well as ice cream shops, places for dinner, and cute shops to poke your nose in. Price: depends what you buy.
All kinds of yummy foods, a chocolate store, and interesting places to look at. Oh, and you should stop at the bakery in there and ask for an earl grey sable. You will not regret it. It's also on the Beltline, which is great to walk along if the weather is nice. If you walk far enough, you'll hit Ponce City Market, which also has lots of cute little places and kiosks (including one that serves cookie dough like it's ice cream).