Mountain biking is bigger than road cycling in New Zealand and there are many council-maintained tracks that cater for bikers, from Whangarei to Invercargill.
Adventure cycling in New Zealand includes mountainbiking, suitable for riders of all abilities. Helibiking takes them one step higher - to high-altitude places for cycling thrills.
If cyclists have plenty of time but little money and want to see the New Zealand countryside, they could try WWOOFing, Willing Workers on Organic Farms.
New Zealand has many excellent places to cycle in and near its cities. You could even join a club while in Auckland, for example, to be shown the sights.