the price to enter the national park is 45 pesos

Do not miss out on going to Iguassu Falls when you are in Argentina. Don't bother about flying if you have time to go on the bus as the overnight busses are amazing. Just get the sleeper and you will get a lay flat seat including dinner and refreshements. Very reasonably priced and you save on a nights accom. We caught the bus up and flew back. The flight back was scarey!