what would you do? If rescue does eventually arrive, would you choose to stay or return home?
I would immediately set about searching the washes-up luggage and bodies for concealed weapons and ammo, and fashion weapon from local materials, so that I and my spouse could rapidly cow, quell, and subdue the remaining survivors and force them to accept us as their King and Queen. We would then order adequate quarters built for ourselves, and organize food-gatherers so that our meals will be regular.
Once food and shelter are secured, we will send our minions out to search the island for valuable resources like emeralds and diamonds so that we can start sending misbehaving people to the mines.
We will find out who has a sychophantic nature and make him/her a straw boss, knowing in advance that this person will be easily corruptible, take bribes, perpetrate petty (or major) cruelties, and steal from us and the minions both, but we will allow it to go without notice because we want the minions to hate someone more (or as much) as they hate us, in the event of sudden rebellion.
We will force the minions to put on pageants and plays written by themselves which glorify our rule, our wisdom, our kindness, and our good works. We will be generous with our applause.
If any babies are born during the duration, we will insist that the middle names be those of either me or my spouse, because to do otherwise would show disloyalty.
If rescue came, we would, of course, leave the island with our diamonds and emeralds, leaving a crew of minions there to work the mines. I suppose once people were around, we would have to start paying them. Assuming the straw boss hasn't been strangled yet, we will reward his/her hard work generously, deducting all bribes and stolen goods from the bonus. But we are out of that hellhole, duh.