The trip takes around 35 minutes. The Speedboat carriea you against the pretty strong stream right to the falls and you will takes a showever underneath one of them which is a great experience. You can store you valuables and clothes in lockers or opt to wear a wet poncho. YOU WILL GET SOAKED, wear swimshorts / bikini instead!
The jungle tour was nice even though we did not understand so many of the explanations, since the tour guide did not speak any English (I guess we were unlucky)