This is the first of (possibly) a series of caches along the Otford - Bundeena Coastal Track.
It's located just north of Burning Palms, at the intersection of the track to Garrawarra and the continuation of the coastal track down to Era beach.
(If the Coastal track is not your thing, there is a carpark at Garrawarra)
Bring small-ish swaps - smaller than about 7cm in diameter.