Q13. The 'pounding feet of the tourists' strongly juxtaposes the 'city's fragile stones', characterising the damage caused by tourists in comparison to the frailer nature of the ancient city of Machu Picchu.
Q14. The author is communicating that an organisation, WMF is trying to develop more policies and campaigns to allow tourists to practice sustainable tourism, with the preservation of sites under threat like Machu Picchu in mind.
''To those who like to break the rules and go against the system!
There is some evidence of neglecting local rules...Why don't you try going against Newton's laws, it could be much funnier.
P.S. Smoking is harmful to your health (especially when you will be spotted with the cigarette by staff.)
Kind regards,
Yours Warden.''