[Drake]

You go into jungle from the town (either entrance works) and look for a cave entrance (well actually it looks like a big tree but with a cave inside). If you enter the jungle from the right (right being the direction if you were facing the town from the beach) most part of tortuga town you just follow the path till you reach the cave. If you take the jungle entrance by the gypsy wagon then you want to follow the right wall and you'll also reach the cave entrance. The path from the gypsy wagon is easier.