Hey scot.
Just take a stubby cooler.

Or if you want to go fishing come up to cairns between christmas and new year - I'll be home with the family. And i hear the reef will be open - hope so am suffering coral trout deficiency since the folks took up the great grey nomad thing and started driving round the country 2 or 3 times.
Summer in FNQ = jelly fish. And they scare the crap outta me more than the sharks you always see

Personally I wouldn't bother with anything. Summer winds in Far north are minimal, which is why it is good fishing weather. Winter is trade winds season.
D