Hi there
There are lots of people fishing on the Orakei wharf, near Mission Bay.
You can get some good snapper there if you're lucky. Also squid fishing is good during squid season. People also fish of the rocks around this area.
Another wharf to try is the cornwallis wharf on the Manukau Harbour. Can get Snapper, Kahawai and Gurnard there. It gets quite crowded on the weekend though.
If you don't mind a little walkabout you could go up to the Whangaparoa peninsula all the way to Army Bay at the end and then walk around the rocks and fish from there.
hope that helps
If people concentrated on the really important things in life, there'd be a shortage of fishing poles.