Go to the start of Es Vedra Viewpoint 1.  Keep following that road until you come to a kind of parking, where you can no longer go any further.  To reach Atlantis and the stone circles, go from the place where you left your car, to the left of the metal pole and the large stone. Follow this road (on your left you will see a kind of fence) for about 200 meters. Then you automatically come to the stone circles. The “entrance” to Atlantis is located on the stone circles to the left of the tree.