The caves and rocks are known locally for being a favourite haunt of seals. There are an estimated 5000 grey seals in west Wales and their pups are born September to December. Seals spend 80% of their time submerged but can often be seen on the rocks at Seals Bay resting between their feeding excursions.
Cwmtydu’s pebble beach has rockpools and is excellent fishing for huss, dogfish, bass, dabs, codling, flounder, plaice, wrasse, gurnards and the occasional tope.
Cwmtydu’s recently restored old lime kiln was originally used to burn limestone brought by boat from Pembrokeshire and Cornwall for use by farmers as fertiliser for the land. North of Cwmtydu also lies Castell Bach with the remains of a 3rd century BC iron age fort.