Translation of gangrene 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.
We headed back to the hotel with a rickshaw, as usual in this part of the world they drove like crazy but it was hilarious. We went to sleep immediately and did not wake up the entire night.
We had a great day in Bolivia and amazing 3 days in the entire area of Northern chile. It was time to move on and we wanted to go South to the capital of Chile. We were so exhausted from our day trip that we immediately fell asleep.