G'day Yabbin,
you can kite in Darwin but due to our 'skinny' wind you tend to use bigger kites for the same given windspeed so bring you big stuff.
This time of year we have sou'east winds in the morning with occasional northerly seabreeze in arvo so we tend to go to 2 spots: Buffalo Creek at Lee Point in the morning and The Surf Club at Casuarina Beach in the arvo.
You can also catch up with Geoff at Fun Supply, he's our local pusher, he'll be able to direct you with a bunch of info, just do a quick search!
http://www.funsupply.com.au/pages/Kite-Surfing-in-Darwin.htmlcheers for now,
Robbie