Countries like Greece, who get a sizeable share of their country's GDP from tourism, are looking forward to welcoming back visitors. Greece will re-open itself to visitors on May 14, Bloomberg noted last week, but will require either a vaccination, proof of recovery from the virus of a negative test before departing for the country. 

Those who require tourism for their livelihoods are ready to move on. Rental boat operator Panagiotis Mastoras said: "It's the safest way. We've reached a point where it can't go on like this."

Greece is leading the way in pushing for vaccine passports - usually taking the form of certificates or digital cards - an idea that is also catching on in tourist nations like Thailand and the Caribbean. For businesses who rely on tourism, the "passport" is seen as a "route to salvation", the report notes.