Fitzroy Island is not an island at all in the geological sense — it is a continental peak, the drowned summit of a coastal range severed from the Australian mainland roughly 10,000 years ago when post-glacial seas flooded the intervening valley. Its granite is the same Cairns hinterland stone that forms the Whitfield Range. The water simply rose around it. The Gurabana Gunggandji people know the island as Gabar and have crossed to it for millennia in outrigger canoes, harvesting shellfish and turtle from the fringing reef. Lieutenant James Cook named it Fitzroy Island in June 1770, six days before the Endeavour struck Endeavour Reef. Later the island served harder purposes: a quarantine station for Chinese labourers bound for the Palmer River goldfields in the 1870s, a beche-de-mer processing camp, and a wartime radar post. The lighthouse on the eastern bluff, commissioned in 1943, guided shipping through the inner passage until automation in 1992. Today the fitzroy island ferry from cairns follows almost precisely that old maritime line, 29 kilometres east-southeast across Trinity Bay. What makes the island matter now is the improbable overlap of two ecosystems. Ninety-seven percent of its 339 hectares sits inside Fitzroy Island National Park — hoop pine, eucalypt woodland and pockets of lowland rainforest running down to a reef flat that begins metres from shore. Coral gardens sit directly offshore at Welcome Bay, so snorkellers reach living reef without a second vessel. The Cairns Turtle Rehabilitation Centre, established here in 2000, treats green and hawksbill turtles injured by boat strike and marine debris, releasing them back into the same waters visitors swim in. Nudey Beach, on the western shore, is coral rubble rather than sand — bleached fragments of Acropora broken by cyclone swell and ground smooth over decades. In 2018 it was named Australia's best beach, a title that redirected considerable traffic toward Cairns Fitzroy Island day tours and the associated island landmarks. The walking network is short but steep. The Summit Track climbs 269 metres to a granite lookout over the Coral Sea; the Lighthouse Road switchbacks through vine forest to the 1943 tower. Both begin within 200 metres of the jetty, which is why fitzroy island ferry from cairns tickets so often function as trailheads rather than beach passes. Entry to the island is free — 0 AUD — with the fare covering the crossing alone.