Hey champ, I lived in forster for many years but I had never had the chance to kite there untill recently.
Ive kited smiths lake in a N/E on the lake side of the beach, only Good if the tide is up as there is a varse amount of shallow water.
Smiths lake is not that great for kite surfing.
Wallis lake I have never kited but have heard it can be ok, Would be best at low tide as the water comes right up to the trees, best spot to kitesurf would be the sailing club which is just south of Forster on the lakes way near Tiona. Best in a N or N/W
If your super keen you could try kitesurf the inlet into wallis lake if you can find a nice spot to launch.
But the best spot to head to would have to be Old bar which is about 45min north of Forster
www.seabreeze.com.au/forums/Kitesurfing/General/Old-Bar-Muddies-Kiteboarder-riding-Area-New/Failing any of these flat water spots, hit one of the MANY beaches in the area.