C.O.
ATL:
Welcome to mamapedia!
I'm sorry - but I personally think that 5 years old is a tad young for a auto racing or Go-Kart Summer camp.
I believe at that age, he would be overwhelmed and end up having a meltdown because he would just be too excited...
Try this website and see what you can come up with
http://www.savvysource.com/camps-classes/ga/atlanta
good luck!