We lived in Japan between 1953 and 1956. This is Cara, swimming in the Japan Sea. We went there nearly every day during the summer and swam. We were not really swimmers -- we usually wore swimming jackets or played in floating toys. The sea was too strong to really learn how to swim. But we all became very comfortable in the water and practically lived in it. When the skies were gray and the wind was strong, it was the time to "surf" the high waves. We usually were the last to leave the beach, which probably frustrated the life guards, as they couldn't go home as early as they wished, since some crazy kids wouldn't GIVE IT UP and go home themselves. Mom usually sat under a beach umbrella and read or sat in the covered little place where we could get drinks. We would pack a lunch; we had to stay out of the water for an hour after lunch so would play in the sand.
This was back in the day when an 11 year old was content to play with siblings in the sea and the sand and not want to be off with other girls, being google-eyed at boys.
Notice the bright blue sky and the dark blue sea. The beach was not as clean as most people today like - it had seaweed and driftwood, but we could play with that, as well. I think Cara was looking for a whale to spear!