Translation of flightless in German

It was after midnight when we finally could go to bed and rest a little. It was good that the search for a better room turned out to be funny and amuzing so that we did not feel sorry about it.
I understand that you use the article 'die' when talking about a feminine object, das when the subject is neutral, and der when talking about a masculine object. But how can you remember all these?
We walked almost every alley in Cusco, stunned by its beauty and ignoring the developing altitude thickness, which resulted in the most horrible night of our lives.