This is similar to the plot of Lord of the Flies by William Golding. I believe this question is for you to put yourself in the shoes of a stranded survivor and write from there. No one can help write what you feel, only you can. Here are some questions that may help:
How long do you think you can stay alive in a deserted island?
Do you trust the boys that are with you? Why or why not?
Do you believe that you will be rescued? Why or why not?
Imagine the best-case scenario if you or the group of boys are not rescued. What kind of governing system would you make?
What is your plan for survival? Make sure to add details.
That's all I can help you with. You can always gain inspiration from Lord of the Flies if you're stuck. Best of luck!