Sumner Beach, Christchurch

Generations of Cantabrians (locals) have promenaded down the Esplanade, which overlooks this idyllic stretch of ocean, renowned for safe swimming and good surfing. Dominating this patrolled beach is Cave Rock, a protrusion of volcanic stone through which the sea has eroded a large cavern. At low tide you can walk right through the cave to an assortment of limpet-encrusted rock pools, each one a tiny, self-contained ecosystem. Beware of deep holes scoured around some rocks. Toilets and changing sheds are available. There are also plenty of cafes and stores on The Esplanade and in nearby Sumner village.