Trails very well set up and signposted. Park very clean, well kept and free of rubbish. Take a poncho if you want to keep any semblance of being dry if you take a boat trip onto the falls! Take your own food and drink if you don't want to be massively overcharged for these. Saw some impressive wildlife inc a croc, many butterflies, a capuchin monkey and many, many coatis. admission was 55 reais. I think you can only pay this in Argentinian pesos, not reais, but my taximan Paris mine as I got transport organised by my pousada, which is a good idea if you want to avoid waiting around any the border if entering from the Brazilian side.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.