To visit the falls, take the bus to the third stop, site of Hotel das Cataratas. Here you can pick up the Trilha das Cataratas, or ‘Waterfall Trail', a 1200m trail following the shore of the Iguaçu river, terminating at the Garganta do Diablo. From here, take the panoramic elevator to get a view of the falls from above.
At the top, a short walk along the road leads to Porto Canoas station, where you will find a nice restaurant with an excellent lunch buffet (R$45) and a food court with less expensive options. Both have pleasant outdoor seating.
Remember, it’s always wet at the falls, and water attracts sunlight. Pack rain gear and sunblock. Bug repellent is a must on the walking trails. Also note that lighting for photography is best in the morning on the Brazilian side.