Many have mountain biked some or all of the Knuckle Hill walk.
Ask about the Viaduct Track.
Head up snake Creek Rd to find the old bridge over the Paturau river or wind your way up the DOC track following Sandhill Creek up to Lake Otuhie and Echo Point. The coast can be hard work amongst the sand but very scenic and well worth the effort.
If you are really up for an adventure, the Kahurangi Light House ride begins with a 45 minute drive south to the Anatori River. Either four wheel drive with vehicles or walk to cross the Anatori. From there, it is an 8km drive to the Turimawiwi river where you leave your vehicle, then an hours ride along the beach fording the Anaweka to the Big River which is crossable only at low tide, followed by another 25 minute ride to the lighthouse keepers house. The Department of Conservation provides accommodation for up to 20 people.