Coastal erosion sucks. The omana park is very slowly ending up on the beach below. Anyway us cachers can take full advantage of the hiding places that the fallen trees provide & that's what I have done here.
You are looking for a camo'd 600ml sistema container. A little clambering around will be required. Also access will be determined by the tide. If you get your timing wrong you could be swimming back. It took me 10 minutes to reach GZ from Omana end & 15 minutes from Te Puru Park end. If you are taking little ones with you get them to hold your hand so you don't slip over 
, It can be very slippery under foot in places. The views from here are fantastic & there are rock pools to investigate & a few small caves. Be aware of unstable banks in some areas. The container is attached by fishing line to try & prevent it getting washed away. Please make sure the line can't be seen when replacing the cache.