That little guitar shop near the Lenox Mall is going to be really expensive (but probably lots of fun to check out) because it's in the Buckhead neck of the woods.

Mmario, will you have access to a car? If you do (or even if you don't, MARTA is incredibly efficient), Stone Mountain Stone Mountain
(not far from where you will be)is a neat place, as is the Coca-Cola museum Coca-Cola Museum Fun
(thought it would be really boring but it was actually interesting)..that's right downtown with a train stop at for the Underground. There's the Martin Luther King Jr. Center The King Center that's interesting (not far from the Coca-Cola museum by train...maybe 3 stops or so....but it is NOT in a good neighborhood) and if you have a car or can find your way there by bus, hit The Varsity Ya gotta stop here!!!...it's just a classic thing to do while you're in Atlanta! It's right off I-85.
    I've been to the Renaissance Festival in Atlanta (ok..just outside Atlanta) and had THE BEST time!!!!!   I know you will too!

Michelle