I had an encounter with Gympie-Gympie/Stinging bush (Dendrocnide moroides) in the early 1980s when I was camping for some weeks at Emmagen Creek, Cape Tribulation which is about 50 miles north of Cairns and past Mossman in Queensland's Daintree rainforest. (Back then, Mossman was a single street with none of the modern luxurious tourist hotels/accommodation that it has today and Emmagen Creek was just cane toad infes…
Just based on Australia's reputation alone I don't think I would ever even think about venturing outside in anything short of a hazmat suit on top of a suit of plate mail :-)