About an hour's walk north of Canoa along the beach, accessible only at low tide, a series of stone structures emerge from the sand and shallows that were built by a pre-Columbian coastal civilisation as fish traps. The stones are arranged in curved walls that funnel fish into enclosures as the tide rises and strand them as it falls — a remarkably effective and durable fishing technology.
The traps were used for centuries before the Spanish arrived and are still largely intact. They are best visited at low tide during the morning when the light is good and the walk comfortable. Check the tide tables before you go — the path north hugs the cliff base at several points and is impassable at high water. No facilities at the site; bring water and sun protection for the walk.