Translation of altruist in German

As it was the primary attraction for all tourist we were "escorted" by a few thousand other visitors. Our guide Samuel informed us about the ancient history of this special place.
In addition I felt were uncomfortable with a ten year old girl rowing our boat while we were sitting like stupid tourists there. I offered to row myself and took the girl's rudder. She was happy.
Well, being the first time in South America, especially Peru, gives you a little shock in the first few hours. Already at the airport everybody wants something ($$$) from you