Your first priority should be to visit the Brazilian Falls. The walk along the gorge starting from just below the soft-pink Hotel das Cataratas is spectacular. Keep an eye out for the hundreds of colorful butterflies. Make the time to get up close and personal with the falls on a zodiac ride. (Note: In the zodiac, a motorized inflatable rubber boat, you will get drenched.) Time permitting, pay a visit to the Parque das Aves for a close-up of the many bird species that inhabit the park. Also worth a look is Itaipu Dam, the world's largest hydroelectric project.
Spectacular Views -- The confluence of the Rio Iguaçu and the Rio Paraná, about 7.5km (4 1/2 miles) south of the town of Foz do Iguaçu on Avenida General Meira, is also the spot where Brazil, Paraguay, and Argentina all meet. Called the Marco das Três Fronteiras, it features a public viewing platform with good views up and down the Iguaçu and Paraná rivers.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.