We will fly into Foz de Iguassu and immediately go to the park to explore the falls. That evening we will be staying at the Sheraton on the Argentinian side. The next day we will explore the argentinian side of the falls until 5 pm when we fly out to Buenas Aires. We want to take the boat ride under the falls.....is the ride any different on the brazillian side vs the argentinian side? Which side takes longer to hike the trails? We'll have about 5 hours on the Brazillian side and about 6-7 hours on the Argentinian side.