A collection of national parks and nature reserves in northeastern Queensland, the Wet Tropics area protects the only rainforest in a first-world country. Some parts of the site are easily accessible from places like Cairns, Cooktown, or Townsville, and the easiest trip (probably the easiest way to see a rainforest in the world) is to make the train ride from Cairns to Kuranda through the spectacular wilderness of Barron Gorge National Park. Kuranda is a charming little jungle town with many attractions, the major one being the way you should get back to the coast - by way of Skyrail, a cableway that lets you see the rain forest from above. Probably a bit questionable from an environmental point of view, but still an unbeatable experience. I suppose it's not such a bad thing that most visitors see only this area, leaving the rest of the Wet Tropics alone.