From Sandy Springs Via Johnson Ferry Road, Start By Heading North On Johnson Ferry Road, Cross Over The Chattahoochee River As You Enter Cobb County. Continue Driving Along Johnson Ferry Road Until You Reach Paper Mill Road Se, Make A Left Turn. Follow Paper Mill Road For Two Miles And Make A Left Onto Sibley Forest Drive. Stay On Sibley Forest Drive, Then Turn Left Onto Gunby Road. You’Ll Find 656 Gunby Road On Your Right.