Tokyo in fact has islands called Tokyo Seven Islands. They are actually part of Izu Islands. In history the owner of Tokyo(Edo) found these islands first then they belong to Tokyo.
Izu Oshima is one of Tokyo Seven Islands. And it is a popular tourist site for the people from Kanto Area. You can access Izu Oshima by ferry both from Tokyo Takeshiba Pier and Shizuoka Atami Pier.
So what can we do in Oshima Island. DIVING!
This bell is called “buddy bell”. Buddy is the most valuable part in diving. Your buddy will take care of you. Vice versa you must watch your buddy’s everything: mood, air condition, gear, etc.
Then you will jump into the blue sea.
You will find a lot of fish. Of course some of them are strange. It is thin and long.
It is flat and big.
And it swims when it roll the flat body.
It is fat, cute and sleepy.
It feels lonely and make a party.
Sometimes you get out of water when the sun just goes down.
Sometimes you can see Mount Fuji many kilometers away.
These are about Izu Oshima Island. Of course just a tiny part of interestings you can do in the island. So why not go and have look by yourself?