It isn't a 'full' level, because the action is short and you can't get any points necessary to unlock some in-game bonuses (no ranking), and therefore I didn't make the map.
You're starting the stage standing on the large, knocked over branch and Kong is situated at it's end. After the last events, the gorilla is furious and he'll knock off your whole group into the deep and dark cave.
When you recover consciousness, you should hear your colleagues. Raise yourself from the ground and move ahead, taking the stream's current.
You'll reach your comrades, standing on the other side of the precipice. After the talk, turn left and move in light's direction, to the exit of the cave.