If you see a beach in your dream or vision, the beach tells the transition between two different sides of yourself. The rational thinking of the beach and the waterfront represents the feeling and emotions.
Another explanation of the beach is that you are in a transition phase in your life, you still have to figure out what you want to achieve or which way your life should go. The beach is often the stopover, the moment when you reflect, relax, make new choices, the moment when you stand still but start working on your dreams, wishes, ideas and possibilities and so on.
Another explanation is that the beach is the place where the spiritual can express itself and pass into a sensation or awareness of a belief, magic, the spiritual in your life. It is the bridge between emotions and feelings, the roots of the past and the unknown of the present.
It is a reflection between diving deep into your past (soul life, womb of life flowing from water and sea) and building a new self and/or life mission. An additional explanation is building a practice dream castle, figuring out, trying and including feeling and experiencing from your heart, your source, your base and everything that comes with it.