Auckland's Hauraki Gulf is a brilliant place for a range of activities. Fishing is marvellous in the Gulf during summer with good snapper available within 1km of Downtown Auckland. It is great area to go sailing or boating as there are plenty of places to stop and shelter. There are also many beaches to explore. If you do not have access to your own boat then would recommend that you try a trip to Waiheke (if want to eat, drink and relax) or Rangitoto (if want a good walk) or on one of the dolphin watching or sailing boats that goes around the Gulf.