Sun protection
The UV rays here are fierce, which is why a hat, sunglasses and sun cream are non-negotiable. Also, if you’re wearing vest tops or camisoles a lot (which, let’s face it, you will be), consider bringing a shawl or light cardigan to protect your shoulders from the midday sun too.
Swimwear
It would be a cardinal sin to travel to Australia and not get in the water. Bring a swimming costume, tankini, bikini, trunks or whatever you usually bathe in for when you’re swimming or snorkelling, and a towel to laze on and dry off with after. November to May in Queensland is the season of the irukandji box jellyfish, but don’t worry too much about packing your own stinger suit; most places have them for hire or have stinger net sections in the water for you to swim in.
If you’re planning to visit the Great Barrier Reef, chances are your tour company will have snorkel gear for you. However, if you’d rather bring your own googles, snorkel and flippers, that’s fine too – just don't forget you have a checked luggage limit.