Translation of incertidumbre

I understood that this was a real problem in this country and many foreigners came for sex tourism. Many bad stories had happened but my hosts were decent people. I could tell that right away.
The writer describes this situation by putting the persons into a natural environment. On one side there was no shade and there weren't any trees, he says. This description can be interpreted.
At the moment we want to keep Vocabulix free. However, we recently added a donation button at the end of each lesson (by Paypal). You may donate 10$ after completing your next lesson. That will do.