If you are after flat water because you are a beginer ignore the rest of this post because it is offshore in a NE seabreeze, and you need to be able to work upwind or it is a big swim. From mid to low tide you can stand up for about 100m out.
About an hour north of Newcastle there is a place called Teagardens / Hawksnest.
Turn in here goto Hawksnest/Jimmys beach (car park or caravan park)walk south till you hit the water turn left walk out towards the end for about 300m rig up and kite 1 meter from the shore in flaaaat water.
The above is for the typical NE breeze we are finally getting.
You can also kite in W,SW or SE but it can be a bit gusty but it is onshore/cross shore in these conditions.
This shot shows where jimmys beach caravan park is, the small pink line on the Port Stephens side of the sand spit is flat water.
www.seabreeze.com.au/gallery/gallery.asp?imageid=2395www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=22509ric