It's hard to fully interpret dreams / visions as they are all unique but here's what some of those symbols you mentioned might mean. I got this info from here. I have used this site myself before and it seems to be pretty accurate. I hope it helps:)

To see the beach in your dream symbolizes the meeting between your two states of mind. The sand is symbolic of the rational and mental processes while the water signifies the irrational, unsteady, and emotional aspects of yourself. It is a place of transition between the physical/material and the spiritual.

To dream that you are on the beach and looking out toward the ocean indicates unknown and major changes that are occurring in your life. Consider the state of the ocean, whether it is calm, pleasant, forbidding, etc.

To dream that you are looking toward the beach suggests that you are returning to what is familiar to you. Alternatively, you may be adapting or accepting to the changes and circumstances in your life.

To dream that you are relaxing on a beach signifies that the coming weeks will be calm and tranquil for you. Your stress will be alleviated and you will find peace of mind.

To see or talk to the dead in your dream forewarns that you are being influenced by negative people and are hanging around the wrong crowd. This dream may also be a way for you to resolve your feelings with those who have passed on. Alternatively, the dream symbolises material loss. If you dream of a person who has died a long time ago, then it suggests that a current situation or relationship in your life resembles the quality of that deceased person. The dream may depict how you need to let this situation or relationship die and end it.

To see and talk with your dead parents in your dreams represent your fears of losing them or your way of coping with the loss. You are using your dream as a last opportunity to say your final good-byes to them.

To see your dead sibling, relative, or friend in your dream indicates that you miss them and are trying to relive your old experiences you had with them. In trying to keep up with the pace of your daily waking life, your dreams may serve as your only outlet in coping and coming to terms with the loss of a loved one.