The Coromandel was rich in gold and kauri trees when Europeans arrived. At Broken Hills, to the west of Hikuai and accessed along the Puketui Valley Rd, this destructive activity left behind some great hiking tracks across very rugged terrain, as well as various mining artifacts.
There are several walking options, but for a full experience, drive to the furthest carpark down the road, past the campsite.Then head south along the Puketui River, following the signs for Collins Drive, a 500 metre old walk-through mining tunnel. Take short side walks to the waterfall at Government Battery and the Water Race Tunnels. The walk then climbs quite steeply to Collins Drive. You will need to bring a torch and mind your head! After Collins Drive, the track is a lot rougher, but there is a short deviation to a great viewpoint to the east, including the Pinnacles. Otherwise keep going till you loop back to the river track. Allow 2 to 3 hours.
This track also connects to a day long (tough) tramping track that connects through to the Pinnacles track network and the Kauaeranga Valley near Thames.