We entered the club which started to fill up around mid-night. The atmosphere was great and many handsome men and beautiful women were dancing on the different floors of the club. We were upstairs. 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? Lunch was given at a family-run restaurant back in the valley. The headaches disappeared once were were back at 2000 meters. From there we continued to the Salar, a salt lake, mostly arid.