Your horses are gone, swept away in the stampede. Sure, you've come across an interesting clue (the recently lit campfire) but you should probably collect your horses first.
Cliffs and Caves Group:
The light tower is clearly transmitting something. And beeping. Lexi appears to have some sort of magic touch when it comes to ancient technology. Good job! You'll just have to wait and see if anyone is receiving your signal.
Petra has found and mapped some sort of building on another part of the island. It looked reasonably in-tact, so perhaps you would find something a little more illuminating there as to what this place is, or was. Do you attempt to sail there? Or travel over-land? Or stay with the tower in case someone did get your signal and is looking for you? Discuss below.