All foreign tourists can now visit Greece without the need for quarantine on arrival, provided they have a negative PCR test. The government plans to declare 80 islands -- including most of the country's top tourism destinations -- Covid-safe by the end of June. The Greek government is welcoming back tourists with the promise of 'Covid-free' islands. But the revival of tourism in Mykonos, the country's best-known party island, rests on the government's decision to lift bans on music scenes and crowds. CNN's Sam Kiley reports. France has just introduced a new color-coded "traffic light system" for when it opens to international travelers on June 9.