Hmm, interesting. If the story was true and I was one of the 7 survivors, then the first order of business to to make weapons for defense. We already know that the island is full of cannibals, so defense is number one. Then like the rest of any good zombie plan, food shelter and water and prepare to fight.
If the story was bogus, and made up to protect the city of gold and all those beautiful women, then the first order of business is to kill the 6 others with me, then sneak back to the city, and slowly assassinate all the others until I am the only one left, (the other explorers, not the beautiful island women) and then proclaim myself king and ruler of the city.