I would bring a gun to hunt for food and to protect myself. Further, I could use the gun to shoot the gun to attract the attention of passing ships. This gun would come with multiple tools so that I could cut wood and make many different household items.
I would bring a tent to protect myself from the heat of the sun, and the dampness of the night. Also, the tent could protect me from bugs, and other wild animals. Additionally, I could use the tent to hide from savages.
However, I would not have money. The money would be completely useless on an uninhabited island.
If I were ever to be stranded on a tropical island, I would be prepared to survive with a multitool gun and a tent: the multitool gun for defending, hunting and attracting notices of ships, and the tent to make my life easier.