The Daintree river, which flows into the middle of the forest of the same name, is a wonderful place. Here you can fish the famous barramundi (the fish that live in the tropical north of Australia, in both fresh and saltwater), and even observe crocodiles in their natural habitat. The forest is a wonder, with shelters, hostels, and holiday centres, as well as nature for everyone - giant bats, huge iguanas, snakes, frogs, and even 15cm butterflies!
I'm going to tell you about the trip I took this amazing green lung of Australia. This tropical forest area of Queensland defies many notions we have about Australia. For example, on the world's driest continent, there's an area that houses the oldest rainforest on Earth. Most of this vast territory, which stretches from the north of Cairns to Cape York, is virtually inaccessible by land, constituting one of the "last frontiers" of a continent that is already a last frontier.
Fortunately, it is possible to visit this extraordinary ecosystem in a very accessible time-frame, since it's just over an hour away from the city of Cairns. I especially recommend the well-traveled walking trails in the park. They are usually quite crowded in the early stages but as you move away a bit of the beginning part it gets better and better. This forest is certainly worth exploring calmly and without the crowds.