birdlings flat and baileys beach are worth a crack. Take the road to akaroa and turn off at the signpost (about 30 mins drive). Have caught seven gill sharks, school sharks, rig, elephant fish, kahawai, red cod, skate and electric rays here. You can buy a map with canterbury surfcasting locations from rebel sport that has a few more options too. They are called spot x maps.
Nice to hear the Kahawai are about off the pier, usually means they will be about off the southern beaches too. Might have to have a crack out at baileys beach next weekend depending on weather and tides.