Tresilian Bay is a small cove of rock, boulders and some low tide sand, with a storm bank of pebbles at the back. This bank is home to plenty of driftwood and japanese knotweed. The coastal path runs along the back of the beach, and a large white house (Tresilian House) sits in the small valley behind the beach. As with most of the Glamorgan Heritage Coast, the cliffs are the usual unstable mix of limestone and shale. There are caves on both sides of the bay; Reynard's Cave is the largest and is on the west side. There are a few WW2 pill boxes situated alongside the coastal path nearby. The closest parking is either at St Donats or Llantwit Major. Dogs are allowed at all times.