How to understand "small island, green tree, hillside and still water"

On the island, I soon found the problem. I accidentally saw a green vegetable field. The captain explained that it is difficult to eat fresh vegetables at ordinary times, which are planted by people in their hometown with soil and seeds. They gave me the only bowl of vegetables at dinner. I'm angry. They shouldn't be special. Then pour the dishes in your hand into the soup, so that a spoonful of soup is scooped into the soldiers' bowls. I see many people's eyes are glowing, and I'm a little emotional. I want to say something, but I can't say anything.

The next morning, I left the island by speedboat. Looking back at the island, I saw a bright red sun rising in Ran Ran on the green.

I gave a standard military salute to the sun, to the green and to the island.