Giday Ian,
I agree with Tony,done the same trip July last year. Alva is a must, ring Matt Payne in Townsville he'll set you straight for Alva. Also make sure you get to Tannum Sands.All the other sites are good as well but leave yourself more time for Alva & Tannum.
You will need a bigger kite for that time of year as well.I used my 18 most of the time.On occasion I did get out on 10 and 14 but mainly the 18.(85kg riding 126 TT)
Best of luck.
Ian