When bathing and frequenting Copacabana became popular, there were rules one had to follow according to municipal instructions in 1921, including what you could wear, how you were to behave and what you could do once in the water. Below are a few regulations…
Art. 11 – Bathers must present themselves with appropriate and decent clothing according to the judgement of the policing authorities;
Art. 12 – It is expressedly prohibited any type of noise or loud voices on the beach or in the sea, during the period of bathing;
Art. 13 – You will be punished with a fine of 20$000 (20 mil-réis), and upon non-payment, five days in prison, for all those that infringe the established dispositions within these instructions.