Take a picture! This was our guide to Tikal, to be consulted when hopelessly lost.
You'll also be happy to know that the flash on a camera acts as a rudimentary flashlight for when you're stranded in the dark on an overgrown trail, or exploring deep into the tunnels of pyramids. The video function can be used to record the howl of jaguars as you venture in the dark to the pyramids to see the sunrise, and to videotape your terror at drawing closer to the jaguars, rather than further away.
Don't you love technology?