Pitty you really should get up to Cairns during that time. Generally that is their season (and it's warm). I've been in Cairns in May and Oct and it was going off.
Brisbane only once in July (Redcliff I think the locals said they also kite Brighton too{on in every state}

) and that was great, but I don't think your in luck on the Gold Coast during those months.
Possibly try
http://www.traqua.com.au if it's still running have not been there for a while.
May be I'm really lucky or wrong or both.
Hope you have wind.