Black Rock Sands is a large sandy beach backed by dunes which extends eastwards for about 1½ miles from the dolerite headland of Black Rock to the Glaslyn estuary. Parking is on the sand, with two main gated access points. The one nearest Black Rock is the main one, and is open from 9.30 a.m. until 8 p.m. The other, at the Morfa Bychan end is open from 9.30 a.m. until 7.30 p.m. Both have (seasonal) toilets ♿, and drinking water is available. Swimming is generally safe away from the Glaslyn estuary, where there are strong currents. Occasionally the waves are big enough for surfing and the beach is extensively zoned for different activities.
At Black Rock there are several caves, and a large stream emerges onto the beach here. At the south-eastern end of the sands is a large sandbar known as the North bank. Dogs are not allowed between the main access point and Black Rock from 1st April until 30th September. A channel (marked by two red posts at the back of the beach) is set aside for the launching of boats, which have to be registered and insured to launch here. Wardens patrol continuously on busy days. Overnight parking on the beach is not allowed.