Port Douglas Australia. The tropical town of Port Douglas, roughly an hour’s drive north from Cairns, has it all: the aquamarine waters of the Great Barrier Reef, the breathtaking canopy of the Daintree Rain Forest, the crystal creeks of Mossman Gorge. and the palm-fringed golden sands of Four Mile Beach. It is the only place on Earth where two World Heritage-listed sites – the Great Barrier Reef and the Daintree Rainforest.