Hi Pete,
What Gateman said = local knowledge -

Check out the link below for SE Qld sites (Approx 400 Kms from Harvey bay to NSW boarder.. Tags are colour coded green easiest yellow next etc , but is dependant on day too.. So on a g8 day a Yellow tag is often ok for a competent beginner but not ok on a hi wind day. Click on a tag and description available.
Suggest use satellite view. For a very friendly zone further up the coast check Lake Weyba.
There are 4 identified zones. Shops/ Svs, Sites, Down-wind zones, and SLSC flags and a couple of no-go areas.
BTW you will likely see kiters in the river mouth at Caloundra (East thru South direction with tidal boost on out going tide) be wary of going in there if you are not confident. It is a high energy zone and if you drop your kite in low wind (so relying on the tide flow) you will have difficulty re-launching. If you get into the wave zone where the tide/waves meet you will get punished - so basically avoid without help / advise - it is far from a 'P' plate zone especially if you are by yourself.
www.google.com/maps/d/viewer?mid=1TAirzud8RXT-EpLY_i6DZx9yuVQ&msa=0&ll=-27.896990128777674%2C153.44268054941426&z=11Couple of schools that way both ok I know MIke at KiteAction he is good and licensed for the area you are in - could always grab a lesson to brush up.
Cheers
AP