What areas of Atlanta can I walk aroun dat night without owrrying of being mugged, killed or maimed?

I am planning on Moving to Atlanta, and I love city nightlife. I know in any city, you should be careful but I've heard that Atlanta is a very dangerous city and I find that disappointing being that may stop me from enjoying it's nightlife. Is Atlanta's crime really that bad, and if it is, why? I like walking in cities, and going for walks in parks and around my house and don't want to give up those things. I want to live within the circle north of I-20 in Decatur/Druid Hills, or even Buckhead. Please be specific with answers. thanks!