Id collect some stones from the beach. A sharp one, a dull one, and a pebble. Id then go to the shrubs and find vines to uze as rope, which id use to make tools out of branches and such. I would avoid going into the dense woods until i figure out how to build a bow and arrow, but likely mu first weapon would be a long thick branch to make a spear. Id likely try fishing in the clesr waters with it. But id also construct a covered area around some close together trees and grab a bunch of leaves from the trees to make something to sit or lye on when i need to sleep. A fire would be required at some point to cook meat, but i dont know how to start one so id likely experiment with some of the stones. Perhaps i would also show others how i made the things, or maybe barter by making multiple tools and shelters and asking for fruit or other useful objects in return for putting shelters together. Maybe our ragged clothes could be used for bandages, and perhaps shoe laces would be useful for early forms of tools id make. Id try and have a go at making a drum and then at night... campfire songs ! ( likely someone would have a lighter or something on them until i master the firemaking with my tools ).