Translation of prolific in German

After breakfast we visited one of the largest markets in the country. It was very close to the hotel and we were tempted to buy souvernirs and other stuff that we would never use ever again.
The trip was coming to an end. We were driving to the airport knowing that we had to fly 12-hour to Spain, than a break in Spain for of around 6 hours and than the rest 4 hours, a total of 22 hours.
As my wife is a travel agent, and knows that in certain cases people do not show up, we decided to take a taxi to the airport nonetheless. It was actually not far from the border, about 5 kilometers away.