They are called the Blue Mountains because of the blue haze from the oil of the eucalyptus trees.
I spent 24 hours of gentle walks and exploring. I went there specifically to draw and was so happy with what I produced. I also did some non-nature sketches and they are all on my flickr site. www.flickr.com/photos/31752495@N03/
I also had time to just sit and draw flora and fauna in the sunshine.