In the geothermal valley, there are plenty things to do. There are tombs to penetrate here, you can hunt for big game and also receive several side missions from locals, thanks to which you gain some experience points. Also, you can try and talk to some of the locals about the current situation, or listen to their conversations. It is a good time to catch some breath, if previous events seemed too fast-paced to you. When you decide to push the story forward, go over the bridge over the river in the other part of the village. There, Jacob asks you to light a signal fire.