Go into the Cave.

You decide to enter the cave, after all you're probably not going to find much better in terms of shelter in the jungle. You think about how you could probably make a torch if you went and found the materials but then an idea occurs to you and you pull out your phone. As you unlock it you are greeted with the unsurprising revelation that there's no service here, would have been nice if you could call someone for help but it's not what you were grabbing your phone for anyway. You turn the device onto low power mode and then turn on your flashlight. This is at best a temporary solution but at least you won't be blind in the cave. You take your light and step into the cave.