Brazilian side
Macuco Safari
(http://www.macucosafari.com.br): offers boat trips up to the base of the iguaçu falls in 20 person zodiac boats. your tour starts at the roadside entrance gate where you board the truck that will take you through the jungle towards the drop-off point. a narrator will describe the fauna that along the way. at the end of the ride, you have an easy hike down to the dock where you should put on your raincoat, a life preserver and place your valuables/dry things into plastic bags. the ride up the river to the falls is quite fun as the boats are powered by the two large motors that are needed to navigate the rapids. during the ride, the journey is video captured for your later purchase. the captains know the rapids well which means that every chance they have to dip the boat and soak the passengers is done. the first pause is at a the beginning of the falls near the launch point for the argentinian boat tours. there is time for photos and then to re-wrap your camera and up the river towards the devils throat. you cannot get that close the large falls as it gets exceedingly rocky in the river which prevents them from going all the way to the base of the falls. however, the captain will get you very close to going under the falls whenever he can. one note:you will get wet-- a raincoat is not enough.
If you go all the way to the "Las Cateratas" station, you will be offered e.g. wildwater rafting & abseiling activities at better rates. When you arrive shortly before the activities close for the day or they're just not busy you can easily bargain about the price and get a really good rate!
Spectacular boat trips can be made under the falls.
Iguazu Jungle Explorer
[email protected], (http://www.iguazujunglexp...): offers trips, including boat rides recommended and rides on 4wd trucks through the park not so interesting. to be booked near the entrance or on the circuito inferior before going down to the ferry. if you do one of the boat rides ar$100 for a short one, ar$200 for a long one which also takes you some way down the river, prepare to get soaked to the skin you'll receive a dry bag for your camera.