Translation of umtauschen

I mean every thief becomes excited if he sees such a stupid tourist as I was. Some little children, I think that they were from xyz origin, came to me and offered me a newspaper and asked for money.
The place was amazing and very interesting although tourists ruled here. At noon we continued to see a waterfall called Agua Azul, which means Blue Waters in Spanish. It was a two hour drive.
On the second day we visited the Perito Moreno glacier by foot. It is one of the most beautiful glacier in South America and certainly the most visited, as it can be reached easily by car.