Translation of strenuous in German

The people in the market knew how to bargain and one would hardly have a change to lower the price drastically. We bought some Espresso cups carved and painted with some local paintings.
The bus driver drove so quickly and with extremely dangerous maneuvers. We were so afraid and the other passengers started to scream at the driver which did not help the situation at all.
Fortunately and against all odds there were seats available so that we changed our booking to the same day. Our destination was El Calafate in the South of Patagonia in order to see the glaciers.