Roughly how much money should I save for a trip to Australia?

I already know the plane ticket cost is around $1,600. But how much should I bring with me? I will be in Australia for a month and I plan to travel to sydeny, uluru, brisbane, tasmania, fraiser island, and canberra. I would also like to snorkel the great barrier reef, zipline in the queensland rainforests, and visit the australia zoo. so roughly how much money do you suggest?