On my way down the boats, I was told that could not buy a ticket there, but as I arrived down there, I was eventually able to get one. But it was very clear that this was in no way a standard routine. I think was a very nice way to approach the falls, but if you want to do the same thing, get a ticket for La Gran Aventura at the park entrance, and then just skip the safari. (That's only gong by car through the forest. It's a lot nicer to walk on your own.) The price is 70 pesos, so it is not precisely cheap.

Anyway, I am now in the boat, and on this picture we see some similar business on the Brazilian side.