It really is worth getting here by 9am: the gangways are narrow and getting stuck in a conga line of tour groups in searing heat and humidity takes the edge off the experience.
Three circuits provide the falls viewing via a series of trails, bridges and pasarelas (boardwalks).
Close to the Circuito Inferior trailhead, the old park hotel houses a small falls museum but it won't hold your attention for long considering what awaits outside.
Relatively few visitors venture beyond the immediate falls area to appreciate the park’s forest scenery and wildlife, but it’s well worth doing. On the falls trails you’ll see large lizards, coatis, monkeys and birds, but you’ll see much more on one of the few trails through the dense forest.
There’s one hotel within Parque Nacional Iguazú.
Numerous snack bars offer predictably overpriced fare. The food is really awful; bring a (coati-proof) picnic, eat at one of two buffet restaurants or lunch at Meliá Iguazú.