Orienteering is a sport where participants have a map and run against the clock. They navigate their way to certain points known as controls where they "punch" the control. This proves you have been to the correct place. Along with the map the participant is provided with a control description to aid in locating the control. End of track is one of these.
The cache is at the end of what would be mapped as end of track. You are looking for a bison tube.
In term 4 of every year the Counties Manukau Orienteering Club runs a Summer Series each Wednesday in the early evening. The courses are located in parks around Pukekohe with this park and surrounds being one of them. These are designed as a fun family activity with the simpler course being done by many young families. This series is a great introduction to the sport which shares many similarities to Geocaching. Participating in this event nutured one of the boys interests leading to him now competing nationally at secondary school level. There is great debate in our house as to which is better, geocaching or orienteering