What is the only thing you can do when it's 95 degrees outside and few places have AC? Get to the water. I arrived in Córdoba, met a girl in my hostel (and another at the bus station), and we set out for the river.
Let me expand a little on the variety of people I have met so far on this trip...
Canadian girl - very nice
Beglium girl - nice
Swiss girl - very nice
American girl - (Californian) She asked me where the capital of Texas is and I told her Austin, duh. She said that she would have assumed it was San Antionio. Idiot. I decided I didn't like her. Later she pulled out a boiled egg for a snack. I definitely didn't like her. So far, she is the only American I have met and she did not make a very good impression.