There are a number of islands called Berneray in the Western Isles, but the main one, the only populated one, this one, is in the Sound of Harris, between Harris and North Uist.
Baile Beach (meaning Town, Village or Settlement Beach) is a lovely white sandy beach backed by sand dunes and only spoiled by camper vans parked up on the top of the dunes. The water's shallow and the sand goes quite a way out, so the water has lovely colours in most lights.
West Beach, Bernery
West Beach is un-named on the maps but stretches along the entire West Coast of the island, and then round the North side. It has a fame of sorts in that a photo of it was used in a Thai tourist brochure. You can see why, but it's been pointed out that you'd probably remember where you were if you took a dip in the water. When the lower picture was taken it was easier to walk backwards because the wind was so strong.