Meno – I hope that was a joke. Halacha doesn’t change just because you decide to call yourself MO.
I agree with Joseph for the most part. Except that I am under the impression that there are very Frum people who go to the beach during certain seasons or times of day when there is no pritzus. So there may be times when it’s okay. I do remember going once for Tashlich and it was fine.