This is a very long beach, and only the naturist section is more than 2 km long. Some sections are also named Moinho de Baixo, Tramagueira and Rio de Prata. The width is quite variable, but in general more than 50 m. The sand is coarse, specially on the south end. It is possible to walk barefoot, but for a long walk you might prefer some kind of shoes.
The beach is backed by a line of low cliffs where rock slides seem to be frequent. At least, this is what you can read on the red signs all along the beach. The rocks behind some of them show that there is a real risk if you are very close. Please be careful and avoid doing things like climbing the cliffs.
While the reputation of the beach and the number of parking places suggest that it could be crowded during summer, having visited it on April I found an almost deserted beach. In the first 200 m of the nudist section there were something like 15 people, and no more than 5 (including me) in the rest. The video below shows that this is not always the case.