I'm looking for information on best practices in tourism used in megacities that are broadly recognized tourist destinations. Any recent data (both qualitative& quntitative) on tourist services and products offered by the city; tourist ifrastructure; tourist attractions and routes; information support for tourism; city brand promotion; networking and stakeholder relationships (investors, public and non-profit organizations, volunteers, sponsors, commercial partners, experts); interaction between tourists and local communities; ensuring the safety of tourists; KPI used by city administrations, etc.

Is there any system of criteria for best practices in this field?