Blackhatwannabe
Listen the concept is one should be as Tzanua as possible at all times. Even in the mikvah one should make every effort to be uncovered as little as possible. Additionally one should not look at the uncovered bodies of the other people there certainly not at their makom…
Regarding swimming there’s no problem wearing a normal bathing suit. As far as speedos I don’t know if they are mutar as they are revealing and the pool is not a mikvah. One may not change publicly by the pool where others will see his nakedness. If you want to see hilchos tznius check out halachafortoday dot com website. You can ask him any questions you have as he is very welcoming of questions and usually answers within a few hours.