Translation of Nebenprodukt

Thanks a lot. Let's meet. Where are you located? OK, do you want to meet there? Basically, June 4 and further would be good for me. But I am flexible. I never have too many things to do in the weekend.
Every school has some narrow minded teachers who are not willing in investing in progressive educational process. They do not grasp that schooling methods today are different from last century's methods.
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.