I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
There is room for parking for a couple of cars at the top of Waterwynch Lane. The driveway itself is a public footpath but is NOT open to vehicles. It is just under a 1km walk to the beach from the main road. Alternatively park on The Croft in Tenby itself, there is a footpath down to the beach and again it’s about 1km along the beach to Waterwych Bay. It is fully accessible at medium / low tide. It is completely cut off at high tide so do keep a close eye on tide times!
Fantastic spot with miles of beaches, 300ft tall cliffs, and a few caves too! 
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 08/05/2024. It remains the responsibility of any pilot to check for any changes before flying at the same location.