A long and sandy bay backed by sand dunes at the northern edge of the mouth of Tremadog Bay, south of Porthmadog. Even though the name suggests a dark beach, you won’t see much in the way of blackness. Black Rock Sands is an open, wide beach with fine sands. The name comes from the area to the west of the beach dominated by a large, multi-coloured headland rock, low-tide caves and rock pools, an area rich in marine life. Natural history is also a feature of the local sand dunes, which have been declared a ‘Site of Special Scientific Interest’. Unusually, you can drive onto the beach here – so it’s a popular spot not just for picnickers and sandcastle builders, but also for motor boats and water bikes which have a special zone designated for their use. Blue Flag & Seaside Award beach. Shop, toilets, slipway, parking. Dog restrictions apply April – end September.