Beach Pictures are popular as they remind the viewer of happy days, lazing around and having fun.
If you're going to paint a beach scene, I think you need to think through some important questions.
If you have never thought of painting a beach scene before, consider why not. Do you not enjoy being there? Do you not like everything getting sandy? Perhaps you should challenge yourself to paint a beach scene - if you get a chance - go and sit on the beach or promenade and sketch or paint.
Absorb the atmosphere and look carefully at the colours and textures. This probably won't be your finished painting - but an invaluable supportive study.