Thread: Where to shoot ducks near Queenstown

I apologise if this has been asked before.
As someone that is new to this sport I am struggling to figure out where exactly I can go to try and shoot a duck or two on opening weekend. With no private land permission.
It doesn’t seem quite as obvious as using doc hunting blocks to hunt deer etc.
I am not asking for a specific location but more an explanation. Can you literally just get yourself set up on any public body of water? Fish and game mention various rivers but they seem to mostly pass through private land.