puerto iguazu or foz de iguacu

hello!
me and my 3 girl friends will be taking the bus from buenos aires to rio de janeiro we will be stopp along the way to check out the falls of course i was just wondering if there was more to do/see on the argentina side or the brazil side.

also i have always wanted to do some zip-lining does anyone know if they offer that anywhere around the falls?

The panoramic view is better from the Brazilian side, but you can get closer on the Argentinian side. Foz is larger, but Puerto I. is a more lively place. Cheaper as well. On either side, the natural parks offer plenty of trekking, bird-watching, etc. Other 'things to do' are somewhat scarce in the region.