Martins Haven is a small inlet at the north-western end of the Marloes peninsula and is the departure point for boat trips to Skomer Island. There is a National Trust (attended) car park at the top of the hill, and access to the beach is a walk of about 200 yards following the lane down a steep hill. The beach is mostly pebbles, flanked by cliffs of various volcanic rocks. Shore diving, snorkelling and kayaking are popular activities. There are toilets here and an emergency telephone. Very little beach is available at high tide.
The car park is listed as a Dark Sky discovery site - a place away from light pollution suitable for some star-gazing pernoctations.