The Esplanade Lagoon is the social heart of Cairns — a 4,800-square-metre free public saltwater pool opened in 2003 on the waterfront. It was designed to solve a real problem: the city is tropical, the sea is warm, but the tidal estuary means no sandy beach and the waters close to shore harbour box jellyfish and saltwater crocodiles. The lagoon gives everyone a safe, free, and gloriously large place to swim.
The surrounding boardwalk, with barbecue areas, fitness equipment, and views across the mudflats to the mountains, makes it easy to spend hours here. At dawn and dusk the light on the water and the hills behind the city is particularly good. Sunsets from the Esplanade are among the better free experiences in Far North Queensland.
The lagoon is open 24 hours, though it is cleaned and briefly closed in the early morning. No booking, no fee, no sunscreen residue restrictions — just show up and swim.