Since 3 May, cafes, taverns and bars in Greece were allowed to open their outdoor areas for all guests, regardless of whether they are vaccinated or not. However, they have to close their doors at 10:45pm and an evening curfew then applies from 11pm onwards.
Upon entry to the country, proof of a full vaccination or negative PCR test, no more than 72 hours old, must be presented. Fully vaccinated, in this case, means that you received the second jab at least 14 days prior. There is no longer a quarantine requirement.
Greece is planning on opening up the country to travellers from EU countries and some other states, such as Great Britain and Serbia, to save the domestic tourism sector.