Does it cost to primitive camp as a walk in?

Yes $26 for non lakeside spots $36 for lakeside https://www.stonemountainpark.com/Campground/Campground-Sites-and-Amenities/Tent-Sites plus the $20 park admission

It costs $20 for the parking/entrance to the park. The cost for the attractions is separate, including going up the Stone, fireworks, train, etc. However, you can explore the rest of the park.

It costs $20 to park for the day. Not sure this is a place for camping.

I'm pretty sure it does it cost me $20 just to go up the mountain or touch the mountain