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When Captain James Cook's Endeavour struck a coral reef off the Queensland coast in June 1770, nearly sinking before being beached for repairs at what is now Cooktown, he could not have imagined that the underwater labyrinth that almost destroyed his ship would become Australia's most celebrated natural wonder. Port Douglas, a small tropical town 70 kilometres north of Cairns, sits at the precise point where two UNESCO World Heritage Sites converge: the Great Barrier Reef stretches offshore in a mosaic of coral cays and turquoise lagoons, while the Daintree Rainforest — the oldest continuously surviving tropical rainforest on Earth, at over 180 million years — crowds down to the shoreline in a canopy so dense it appears as a solid wall of green from the sea.

The town itself is an exercise in tropical refinement. Four Mile Beach, a crescent of pale sand fringed by coconut palms, anchors the eastern edge of Port Douglas and provides the kind of postcard scenery that fills travel magazine covers. Macrossan Street, the main commercial thoroughfare, is lined with boutiques, galleries, and restaurants that reflect the town's evolution from a 19th-century goldfield port into one of tropical Australia's most sophisticated destinations. The Sunday Markets at Anzac Park, held beneath a canopy of rain trees, overflow with tropical fruit, local honey, handmade jewellery, and the macadamia products for which the region is famous.

The Great Barrier Reef from Port Douglas is accessed via the Low Isles — a coral cay and surrounding reef flat just 15 kilometres offshore — or the outer reef platforms at Agincourt Ribbon Reef, where the continental shelf drops into the deep Pacific and coral diversity reaches its zenith. Snorkelling and diving here reveal an underwater ecosystem of staggering complexity: staghorn coral gardens, giant clams, Napoleon wrasse, and the balletic movements of manta rays gliding through cleaning stations. For those who prefer to stay dry, semi-submersible vessels and underwater observatories provide window-seat views of the reef without getting wet.

The Daintree Rainforest, beginning just north of Port Douglas at the Daintree River crossing, is a living museum of Gondwanan evolution. Guided walks through the forest canopy reveal plants that were ancient when the dinosaurs were young: primitive flowering species, towering fan palms, and strangler figs whose aerial root systems form Gothic cathedral arches above the forest floor. Cape Tribulation, where the rainforest meets the reef at a white-sand beach of cinematic beauty, is one of the only places on Earth where two World Heritage Sites exist side by side. Saltwater crocodile spotting cruises on the Daintree River are a thrilling addition, the prehistoric predators basking on muddy banks in plain view.

Port Douglas is visited by Carnival Cruise Line and Celebrity Cruises on Australian and South Pacific itineraries, with ships anchoring offshore and tendering passengers to the marina. The optimal visiting season is April through November, when the dry season delivers clear skies, comfortable temperatures, and the best underwater visibility on the reef, though the town's tropical latitude ensures warm weather year-round.