If you are into rainforests etc, make sure you get to Koranda "not sure on spelling" its just outside of cairns, the big gondala ride is great for the kids, they have a big river at the top that is also a winner with the kids and ME you can hire canoes and paddle around for quite cheap.
They have some nice cafe's up there and really cold beer in the pub.
I am not sure how much you are cramming in on your holiday but it is best to plan for a day up there, and retire early afternoon for a wine back at your hotel in Port Douglas overlooking the water...
The Tempreture is starting to lift, you guys will want to move up here for sure beautiful one day, perfect the next. DONT BRING THE RAIN ANd COLD WITH YOU!!!
Townsville is really looking nice now, its quite a brown town as you will see but the council there are doing a great job over teh last 10 years, the touristy areas around the strand etc are really nice, Magnetic Island will be perfect this time of year, expect a calm bay somewhere, i suggest the mini mokes if your budget is not too tight, Freedom is paramount to get the most of your time, the stingers dont come in until closer to Xmas so snorkeling is on or a trip to the reef scuba diving is certainly rated, i have only done that once and it was from Townsville.
As for the Gold Coast, Getaway on thursday nights usually covers it twice in every episode,,,
If you like all of that then you will absolutley love Airlie Beach & the Whitsundays for your next holiday...
Cheers