Translation of backwards in German

In the end we went up to the tower. We have never climbed so steep stairs ever before and once up we were really afraid to go down. There were no safety installation at this tower.
We decided to walk back and explore the city on foot. It was hard to cross the streets as there was an endless flow of motorcycles and bikes. One needed to just enter the street and cross it.
Sorry but I hadn't have enough time in the last two weeks to respond to your email and to your interesting offer. I really need to think about it a little longer, and I am sure you'd understand.