Spelman, Morehouse, Clark-Atlanta and Morris Brown are all within walking distance of each other (I sure did it enough!). Ga Tech is probably 15- 20 minutes away, GA State another 10 from Tech and Emory is probably 15 - 20 minutes from GA State. Atlanta is also the home of Mercer University, Agnes Scott Olgethrope University, oh yeah and GA Perimeter College ( 2 year school).
Other things to do....
The King Center of course--an ATL must do
The Hammond house it is a really masion that was built by the former slave that founded Atlanta Life Insurance Company and is next to Morris Brown College.
Stone Mountain--they've added a lot of new attractions this year and most people try to stay for the laser show. I have never, however, been able to get with the fact that they play "Dixie" at the end of it
The National Black Arts Festival is now an annual event in Atlanta and brings many cultural things to the city like plays, art exibits (including stuff for sale), poetry readings, etc. I think it starts in July. I'll find out for sure and let you know.
Check out the DeltaNET on delphiforums.com. Since the Delta convention will be in Atlanta this summer there are a lot of suggestions on things to do there (especially resturants.)
Hope you have fun!