The High Museum is pretty cool.
And Atlanta Underground is a must-do tourist destination. I think it's a bit silly, but people seem to be into it.
And, although it's not "healthy," you could visit the Coke Museum. It's actually pretty interesting. You learn about the history of Coke, who created it and why, etc. I sat through some weird/creepy "Coca-Cola makes the world a better place" video in a viewing room.
Virginia Highlands is good for eating and shopping. It's heavy on boutiques and stuff like that.
The Braves Museum is pretty cool too, if you're into baseball.
But if you have some serious time to kill and want to do something really fun and campy, go to Stone Mountain!!!
I've never lived in Atlanta, but my brother lived there for six years, and I used to visit him a lot during that time.
Oh yeah. Uh, the largest porn store/sex shop on the East coast used to be in Atlanta. Damn, I can't remember the name of it, but it's three or four stories tall. Now tha'ts something to see.