Translation of pícaro

I grabbed a burger from an American fast food chain and swallowed it immediately, as I had not eaten for a while. I boarded the machine and could feel a slight stomachache but decided to ignore.
Everyone has the right to get a second chance, the option to live in reconciled circumstances. The environment has so much influence on us that we need to be aware of it even in very hard times.
We were Lao Cai around six o'clock but the train left only at eight. I was somehow relieved though that we had all the dangerous bus journeys behind us and that we left this lovely place soon.