Not to beat a dead horse, but another article some might find interesting:
https://www.bloomberg.com/opinion/articles/2019-06-09/europe-s-top-vacation-sites-need-options-to-fight-overcrowding
This one suggests the way to go is getting rid of the aviation fuel tax exemption.
This article discusses that in more detail:
https://www.euronews.com/2019/05/13/climate-change-aviation-fuel-tax-would-cut-co2-not-hit-jobs-leaked-eu-commission-report-fi
Pros - reduced CO2 emissions, reduced passenger volume, increased revenue for local governments
Cons - more expensive to travel, people can be priced out of the opportunity to travel
Certainly, I can't imagine there's any quick fix (and no one's suggesting there is). Ditching the aviation fuel tax exemption seems to have a certain number of benefits, but trying to price folks out of travel seems less than fair and only one of the number of ways problems should be addressed. Countries are already looking at others - limiting cruise ship passenger visits, putting limits on AirBnB rentals, proactively encouraging people to visit off-season and to less popular locations, etc.