Passport, visa & entry requirements

Are there special entry requirements for children? Can I travel to Greenland with a Danish residence permit? Can I travel to Greenland with a Danish visa? Do Canadian citizens need a visa for Greenland? Do EU citizens need a visa for Greenland? Do I need a passport to travel to Greenland? Do I need a return ticket to enter Greenland? Do I need a visa to visit Greenland? Do UK citizens need a visa for Greenland? Do US citizens need a visa for Greenland? How long can I stay in Greenland? Is a Schengen visa valid for Greenland? Is Greenland part of the Schengen Area?