Translation of pecadillo

One of the most difficult problems I have (and I am sure that others have it too) is getting used to the superficiality of the life in the US. To be superficial means to me not to be able to recognize.
I visited a few churches near the center and decided to climb the mountains nearby, on which there were also churches. My intention was to get a good shot at the town from above, a bird view.
We had to be careful of not falling into the water. We rowed for about an hour and we got tired pretty easily. Especially the other man and woman looked devastated, at the limit of their physical capabilities.