Swanlake Bay near Manorbier, Tenby, Pembrokeshire
Swanlake is certainly not an official naturist beach and is predominantly used by "textiles". However, both groups coexist very happily together. This, I believe, is how things should be everywhere.
The bay is best approached from East Moor Farm where the owners have provided limited car parking with an "honesty box" for nominal charges. There follows a ten minute walk down to the beach, with a short scramble down at the end. The beach is relatively isolated, but is overlooked by the Pembrokeshire Coastal Path which crosses behind the bay.
The naturists tend to scatter themselves randomly, but they encounter little or no hassle. Bolder naturists will stroll from their "pitches" down to the sea. On less crowded days it is possible to walk the whole length of the beach completely naked while the textiles remain below the rear of the bay. I think the place is fabulous, if only because of its "live and let live" attitudes. Ideal for first timers.