Jump up and grab the handholds on the ceiling again.
Now monkey swing straight across the river. The waterfall will be on your left.
Keep going until you reach the far wall.
Then drop onto the stone ledge below.
Turn left and follow the path upstream.
Take a running jump across the water to the square block to the left of the spikes and blades.
Turn around and take a running jump to grab the handholds on the wall beyond the spikes.
Climb upward and to the left as far as you can.
You'll come to a flat ledge. The first (rightmost) block slopes down toward the water and is very slippery, so don't drop down there. Climb just a little farther to the left and drop onto the next block.