Tateyama: Beach near Tokyo
Tateyama in Chiba (the east of Tokyo) has one of the best beaches near Tokyo, located 2 hours from Tokyo by train. Compared with the beaches in Kanagawa to the west from Tokyo, they are less crowded and cleaner.
Due to the sand composition made by volcanic activity, the color of the sand is not white but black or brown. But still you can relax on the beach seeing the Pacific ocean.