Maya, here are some links to stuff around here you were asking about.
First, the yahoo group... http://groups.yahoo.com/group/raisingexplorers/
Then... the art gallery stuff you wondered about...
There is a children's art studio and gallery in Kennesaw. It would probably be the closest one to you Maya.. and it might prove more interesting to Violet to see children's artwork, at least for a first time. It's called The Art Station. The gallery is open 10am-5pm, monday - friday. Maybe we could plan on going together. The link ( http://artstationcobb.org/gallery.html
There are also classes available.. There a bit expensive for my taste, my son likes clay and wants to try pottery wheel.. but, they don't have pottery wheel for his age group.
Tellus Science Museum... This is I think near Cartersville,which is going to be the closest science museum to our area. The info says it has interactive exhibits for even "the youngest." http://www.tellusmuseum.org/index.htm
This is Jump It's! An indoor inflatable playground. It is on Due West Road. http://www.jumpits.com/MainPages/Location.asp