These waterfalls are huge and definitely worth a visit. There is an upper fall that feeds into a lower fall that has a great area for swimming, also cliff jumping.
You'll need a vehicle or a shuttle from Dominical to reach the trail to the falls. There is a fee to use the trails so make sure to pay at the gate. To get to the falls themselves you can hike or take a horseback tour. The hike is about 3km all uphill and takes about an hour.