400
The narrator notices beautiful things about her home: the seagull with the silver fish, the smell of the sea, the greetings of the fishermen, the blue sky, the white sand; but also ugly things: the rubbish floating in the water, the hot sun, the run-down houses. How does that relate to her "bobbing" feeling of "I shall never see this again"?
She is happy and sad to be leaving, and noticing things both good and bad about her home.