How can I know some good places to change my clothes on the beach?

Can they be treated as dressing room like in shops? What are the chances for washing or changing a clothes loos or changing a few in the changing rooms? Could dressing/changing cabin, as long as this structure can be really small, so we can’t call it building?

I found that I should look at a thread with similar issues. I am new here, and will check my latest post. html. What is changed cabin, changing cubicle are discussed there? Which term seems to be more British and another is American?