Horseshoe Bay's pink sand is the work of a single-celled animal. Homotrema rubrum, a red foraminiferan barely a pinhead across, encrusts the shaded undersides of Bermuda's reefs; when it dies, the Atlantic surf grinds its blood-red shell in among the white grains of coral and mollusc and washes the mixture ashore, where a dusting of red in a field of white reads as pale rose. The crescent it colours is Bermuda's signature beach, roughly a third of a mile of sand at the heart of South Shore Park, closed at either end by pitted, honey-coloured headlands. Those cliffs are aeolianite: ice-age dunes of the same shell sand, cemented into stone, then cut back by spray into arches, ledges and the offshore stacks that stand in the shallows. The whole island is a limestone lid of this kind, resting on a volcano that went quiet about 30 million years ago.
Come early and the bay is yours: a long, empty curve, water shading from clear to deep turquoise over the sand bars, and nothing on the sand but the marks the night's surf left. The sea here is Atlantic, not Caribbean — close to 28°C in late August, nearer 20°C in February — and it breaks onto open ocean with an undertow to respect; since September 2025 six lifeguards brought in from Britain's RNLI have covered the beach year-round, ending decades of summer-only cover. Midday belongs to the cruise-ship buses, but walk east on the sandy trail under the cliffs and the crowd thins within minutes into a chain of small coves. In March and April humpbacks pass offshore, headed north from the Caribbean; from March to May longtails — Bermuda's national bird — wheel in pairs above the headlands before dropping into crevices in the rock to nest.