Auckland Aero Club:
www.aac.org.nz
North Shore Aero Club:
www.nsac.co.nz
Whenuapai Aviation Sports Club (gliding):
www.wascnz.com/indexg.htm
Whenuapai Aviation Sports Club (power):
www.wascnz.com/index.htm
There is also a microlight club at Pikes Point aerodrome (Onehunga - between Ardmore (Auckland Aero Club) and North Shore... Not sure of their website.
They are all good places to fly - I have flown at three of the above clubs. Send me a message if you want any more detailed info!
Dupre.