If you are heading to Waipatiki Beach, look for a sign made from a surfboard on your right, and opposite this is the entrance to a couple of bush walks. Follow the track to the lookout, which goes to the right. You will need a good rest by the time you get to the top!
Cache is a small Sistema container with some trades and room for TBs.
Sorry - the log is just made from a scrap of cardboard as that is all I had on me at the time.