Gadling

While you can also access Iguazu Falls, which is sometimes spelled Iguassu Falls, from Argentina, for views and photography the Brazil side is better. These waterfalls are enormous, and are taller than the famous Niagara Falls and two times as wide. You'll need at least one full day to explore the area, although two days is preferable. Likewise, a boat trip under the falls adds a bit of adventure to the excursion, and can give you a new perspective of the site. 

SF Brit; flickr 18/06/12