These rules might fit under the rubric of a traveller's ethic, a set of precepts that allows for greater enjoyment and less hassle while travelling, while at the same time protecting the environment and culture of the place visited. These rules can be considered analogous to camping rules like "take nothing but pictures; leave nothing but footprints."
Still, if counting must be done, two further rules:
Only international travel counts. Seen one US berg, pretty much seen them all.
Only going beyond the transit point counts. That means out of the airport, train station, bus station, wherever. You've never been someplace if you see the inside of its airport. This is the only reason I can't count Japan.