Lydstep Caverns is a sandy beach located west of Lystep Head. Unless you want to do some snorkelling or swimming this beach is only worth visiting when the tide is at its lowest, and preferably on a spring tide - outside this time it's mostly underwater. The beach is backed by high limestone cliffs and is a popular venue for climbers. As its name suggests, it has some spectacular caves and arches, including the 70 yard long Smugglers Cave.
Parking is either at Lydstep Head or Skrinkle Haven. Lydstep Head is the closest one, and is reached by turning off in Lydstep village onto a byway signposted as a no-through road. Follow this very bumpy lane for about 300 yards, then turn right to the (free) National Trust car park at the top of the hill. Follow the coast path westwards to the bottom of the steep valley, where there is a way onto the beach.