Fire:
You can build a fire fairly easily with the right materials and tools. It is important find fuel wood to start and maintain a warming fire. Try to find small, dry items such as grass, leaves, or newspapers. Fast and repetitive friction between different kind of leaves can produce the start of fire.
Shelter:
You can build a shelter by using big leaves, grass of different kinds and stones. The leaves will be very important to build the roof and the grass will be important to build the floor. We will use the stones to produce stability to the shelter.
signal for help
You can make a signal for help by using big leaves as well. Just try to make different letters with the leaves: a big S, a big O, and a big S. The color of the leaves must be different of the color of the floor. It is important that planes can read from the heaven the letters S.O.S.