Flight options.
There is 2 Airports serving Iguassu (Iguazu, Iguaçu) Falls, IGU on the Brazilian side and IGR on the Argentinian side.
See here for a map of airports connecting to IGU and IGR forums.dansdeals.com/index.php?topic=3052.msg1363094#msg1363094
When searching for award availability search first to connecting airports as for example, from NYC VIA Brazil search
LAN thru Lima Peru (cheapest option usually) Oneworld (BA Shows Lan)
JFK-GIG on Tam (BA.com) and/or AA (AA.com)
JFK- GRU AA, Delta
EWR-GRU UA
COPA airlines flies thru Panama City and GRU (usually 2 stops)
Argentina options
Aerolineas Argentina JFK-EZE
LAN Argentina
Hotels Belmont in the Brazilian side of the park
Sheraton Iguazu in the Argentina side of the park. (SPG)
Park Hyatt Iguacu Falls coming soon!
Major ActivitiesThe Argentinian side is more up-close and personal.
You will need to walk both the upper and lower trail on the Argentina side. The upper will take about an hour, the lower about 2. Make sure to do the boat ride on the lower trail for the most awesome views. You will get soaked so take along a ziplock for your camera. You can also take the train to Devils point
The Brazillian side is more of a panorama view.
On the Brazil side at the falls there is less walking as you are not next to the falls like on the Argentina side but rather across the river from them. You will take a tram to the start of the trail on the Brazil side and just walk along side the falls, starting from the pink hotel till the end. When you get to the end is when you will be totally blown away. Walk out on the boardwalk and you will get the most amazing view of the falls.
Bird park well worth about an hour
Helicopter tour on the Brazillian side (Argentina band it as its not Eco friendly)
There is a huge dam you can tour that powers all of Paraguay and huge portions of Brazil and Argentina
Airport Transfer OptionsCabs are available at fairly cheap from both airports to the park and hotels (cross border too)
Trip Report:CGR (Brazil & Argentina):
https://forums.dansdeals.com/index.php?topic=128303.msg2555280#msg2555280 ad120 (Brazil & Argentina):
https://forums.dansdeals.com/index.php?topic=130711.0