One of the coolest things you can do while in Cairns is ride the Skyrail Rainforest Cableway. Set aside some money for the excursion and ride it through a lush rainforest. Sure you might not see any animals but you'll see an assortment of flora that boggles the mind. Some of the trees are only native to Australia so it was really cool to check them out along with the views of one of the last preserved rainforests on earth. Enjoy the ride!