For an idea of what there is to do at Stone Mountain State Park, I have a blog entry/campground review on my blog site:
Stone Mountain State Park | streaminacrossamerica.com
We only stayed for the Memorial Day Weekend at the campground, but I'd be glad to answer any questions that I can. We live about 45 minutes away and used to go to the laser show every summer and many times at the Christmas Holidays and Halloween. In addition to the activities I described on my blog, there is an outdoor history museum with many buildings that come from actual plantations from the 19th century, golf course, and paddle wheel river boat on the lake.