А вот и официальный ответ по поводу входа в парк на аргентинской стороне:
Good day, Thanks for contact Iguazu Argentina
Welcome to the Iguazu National Park, we hope you enjoy the visit.
Admission fee to the park is only paid in pesos argentinos and in cash.
It is not accepted credit cards or other currencies for the admission tikets.
The park schedules is from 8:00am to 6:00pm every day of the year.
The Iguazu National admission fee is of the $ 500 (Argentine Pesos) by person, and includes:
• The Ecological Train of the Forest,
• As well as the crossing in boat to the Island San Martín,
• the access to the Nature Visitors Center
• the access to the peatonales footpaths within the Area Cataracts:
• Devil`s thraot
• Uper and lower circuit
The duration of the routes is the following one:
Center of Visitors: 25 min. Without stairs.
Green Footpath: 20 min. Without stairs
Throat of the Devil: 2 hours, without stairs.
Superior Circuit: 1:15 hours, without stairs.
Inferior Circuit: 2:15 hours, with stairs.
Island San Martín: 2 hours, with stairs.
Macuco Footpath: 3:00 hours, with stairs.
The route in the Ecological Train of the Forest is of approximately 20 minutes of Station to Station plus the time of delay.
You can enjoy the second day, revalidating your ticket and get a bonus for the second day.
Do not forget to stamp your ticket at the end of your first day of visit. Available only in the park in Argentina.
Can make various day trips for more information join our page to
http://www.iguazuargentina.com/actividades.php
or Brazilian side
www.cataratasdoiguacu.com.br to have accommodation information our page to
www.iguazuturismo.gob.ar or send mail
reservasiguazu@amerian.com ( Hotel Amerian ).
16:Preziosa(1) Mediterranea(11) 17:Deliziosa(4) Magnifica(9) Fascinosa(11) 18^Cunard (1) Carnival Inspiration(3) Seaview(11) Rhapsody of the Seas(12) 19:Splendida(1) Venezia(3) Preziosa(4) 20:Diadema(1) 22:TUI(12) 23:Splendida(1) 24:Millennium(4)
получается 375 песо чел./день.(если объединяться). А по правилам 500 песо. Такая экономия. На шураскерию не хватит. 
