When we did this before, we met in Cartersville at State Route 20 and I-75.
I had originally thought of meeting up by 10 but since we can get an extra hour of sleep Saturday night, how about 9?
We'll go over through Rome and up to Summerville. Then on to Cloudland and work our up to the Cloudland Canyon State Park.
From there, we'll travel the Lookout Mountain Ridge and maybe stop and watch the hang glider fools take off toward Alabama, providing there's enough parking space along the side of the road.
Continuing on, we'll go over Lookout Mountain and down into Chattanooga, working our way back around to I-75 South to Ringgold where we'll stop for some BBQ.
West Georgia folks might want to return home via I-75 while East Georgia may come cross-country and enjoy the bends in the road, time allowing. I haven't plotted the time, yet but before, we got back in the late afternoon.
Edit: It's only about 2.5 to 3 hours into Chattanooga, so say we leave Cartersville at 9, we'll hit the interstate in Chattanooga about 12. Then from Chattanooga down to the BBQ restaurant in Ringgold is only a half hour. Take an hour to an hour and a half for lunch puts us about 2 getting finished. I-75 back down to I-285 is 1.5 hours. Total around 7.5 to 8 hours.