Another reason for a good long walk or mountainbike, taking in the views from Campbell's Mill Road. This is an excellent MTBing area, and you'll almost certainly see others out and about.
Be prepared for a long walk or ride, and also carry some extra protection from the exposed conditions that can occur up on these tops. Its possible to make a good loop from combining the Whareroa Farm Park tracks, and this track with some creative trip planning. There are other caches in the area too.
Watch out for those flying cows though! Please replace the cache carefully.