Translation of momentous in German

We sat on the balcony and saw that the hotel had even a pool on the roof top but I did not have the courage to jump in. It just looked to dirty and as no one was in there I did not need to be the first.
I wish you would help me to improve my Spanish. I am studying law in Germany and I am trying to learn Spanish. I hope you can help me and I could help you to learn German. Have a great day.
The next morning, we got up at 5, had breakfast and headed back to the same airport where we landed a few hours earlier. The 1 hour flight was packed with lots of tourists of all ages, mainly Americans.