Olho de Boi beach is located in Buzios, Rio de Janeiro state. It requires a bit of an effort, as you’ll have to walk for a bit on a trail (along two other beaches),
before you can descend to this tiny beach. You’ll be rewarded with calm waters, where you can sometimes even spot some turtles!
It’s a great naturist spot, and I wouldn’t go to any other beach around, especially if I had to wear a swimsuit there. Another beach of this kind in the state is Abrico. Swimming in the sea the natural way is one of the most pleasant ways to experience the contact with nature!