Translation of frequency in German

Then we did a boat trip which started somewhere in the delta and ended somewhere else in the delta. Each couple received a boat and an elderly lady had to row. I did not feel comfortable with that.
I hope you can understand my English. I want to study English over the Internet! Sorry for not having written you during the last few days, but I am starting a new job on Monday and gotta relax till than.
The next day we had the feeling that the worst of our altitude thickness was over and decided to take the local bus to the Sacred Valley, a key area of settlement to the Incas.