Price has gone up to 18 US dollars to walk down to the falls. There is also a life guard watching over the pool too. Not really pertaining to the review but the map is many miles off the location. The falls are on the other side of the volcano Arenal, a few miles SW of the town of La Fortuna.
I walked to the waterfall from La Fortuna in the morning, very beautiful place, I went swimming in some of its pools, great excursion. I added some pics.