Women may go to beaches
with their husbands or fathers. They do not go into the water but they see (Part No. 26; Page No. 297) almost naked men and women before them. Would their male relatives i.e. father, husband, and so on, be considered Dayyuth (a man who does not feel jealously protective of his female relatives' honor)?
If the beaches are as you have mentioned, it is not permissible for a Muslim to go there whether a man or a woman, whether there is a Mahram (spouse or permanently unmarriageable relative) for women or not, and whether they go into water or not. These are places of temptation and deniable acts. Those who go there will surely see the peoples' `Awrah (parts of the body that must be covered in public) which is against the Law of Allah or mix with women without their Mahram and other scandals. Going frequently to these beaches kills jealousy and allures to sins and abstaining from these places secures safety and preserves chastity and honor.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.