Can I go to the sea or to the beaches?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and  Messenger.

Going to beaches and sea for a walk, picnic, swimming, etc. is permissible except if the place contains abominable acts such as nudity, mixing men and women and practice of evils, etc. which is common in some parks, then it is not permissible to be there.

However, it is permissible to visit those places for the sake of Da'wah (calling people to Islam) and to prevent them from evil if one is sure that he can control himself from being attracted to sin.

Allah knows best.