The island has 12km-, 25km- and 70km-loop bicycle routes, but prepare for a lot of hills. Mountain bikes (half-/full day $20/30) can be hired at Waiheke Bike Hire (09-372 7937; Matiatia Wharf; 9am-5pm), or you can cheat on the inclines with electric bikes.
Waiheke Auto Rentals (09-372 8998; www.waihekerentals.co.nz; Matiatia Wharf; car/4WD from $55/80) and Waiheke Rental Cars (09-372 8635; www.waihekerentalcars.co.nz; Matiatia Wharf; scooter/car/motorbike/4WD from $55/55/75/80) offer rentals, but you must be over 21 and pay 60c a kilometre for cars or 4WDs. The insurance excess (deposit) is $1000.
The island has regular bus services, starting from Matiatia Wharf and heading through Oneroa (adult/child $1.40/80c, 2 minutes) on their way to all the main settlements, as far west as Onetangi (adult/child $4.10/2.20, 32 minutes). Enquire through MAXX (09-366 6400; www.maxx.co.nz). A day pass (adult/child $8/5) is available from the Fullers counter at Matiatia Wharf.
Try Waiheke Taxi Co-op (09-372 8038), Waiheke Taxis (09-372 3000) or Waiheke Independent Taxis (0800 300 372).