I guess the best way to avoid any problems is to have a reasonable dress or clothes to wear over your swimsuit for the beach. I have not yet gone swimming at the beach however I have heard that the ones connected to the hotels etc are more accepting of the western swimsuit etc.

I usually wear a single with wide straps and work out tights to the gym. I have a gym in my house so it is different but I am looking to join the new fitness first opening soon. I guess I will see how open they are to the dress code then.

Good luck and i guess just be mindful and if you think it shows a bit too much skin... it is better to cover up and be safe not sorry.

Good luck