View this 800 year old yellow wood tree, by taking one of the many day trails within the Hogsback area. For more info on the day trails, you could visit the tourist information center (S32° 35.881 E26° 56.314) and pick up a copy of a map (Link to a MAP), which has walks of the area.
Some GPSr's may not get a good reception reading under tree cover. If that is the case, all i can tell you is to start looking downhill from the Big Tree.