The Rio Embudo offers roughly 5 miles of steep, expert only, whitewater kayaking. There is very little room for error, and very little chance of hiking out anywhere along the route besides the put in and take out points. The run itself is incredibly beautiful, with steep canyon walls and forest - if you are able to take a minute to look without getting swallowed into the river. Huge boulders are what create the Class V+ rapids - the word Embudo means "funnel" in Spanish - take heed of that, as the water really does tend to funnel between large rocks, making for difficult maneuvers. The best time to run the river is usually May and June, but check the USGS gauges before attempting.