In the tropics, lightweight casual clothing is suitable at all venues, all year round. In the southern temperate regions layers are the best solution for warm days and cool nights, and smart casual clothing is the norm almost everywhere. Warm clothing is recommended for visiting the southern states between May and September.
"Must Packs" include: comfortable walking shoes, swimming costume, hat, sunglasses, high protection factor sunscreen, a cardigan or jumper (even the Red Centre can become quite cool of an evening)... and of course your camera!
Please note, that there may be luggage restrictions on some regional flights (eg: Cairns to Lizard Island). Visitors are therefore advised to bring a small bag to be able to transport some of their luggage for this part of their holiday. Storage facilities are usually available for the excess luggage at departing airports.