Swimming in Japan

Hi there!

Good question, I know there are several beaches around Kamakura (near Tokyo), an other beautiful visit is the Izu Peninsula which offers very beautiful coast lines and you can enjoy the view of mount Fuji as well.

Shikoku have many many beaches all round. If you really wish to enjoy a couple of beautiful spots I would suggest visiting one of the smaller islands around Shikoku. For instance Megijima Island is very beautiful.

Hope this helps!
Daniel