Spanish Practices?

Spain (which has had a very unhappy time in the pandemic) will be reportedly open for tourism from July with a government 'guarantee' of safety from Covid-19 for both locals and tourists (https://www.theguardian.com/world/2020/may/23/spain-to-reopen-to-overseas-tourists-from-july). It is difficult to see how precisely this guarantee will work as the country generally has some 80 million visitors per year as well as lots of entry points (airports, border crossings and ferry terminals). Not being an island, being a location used for short breaks and having tourists from a very wide range of other countries, all make regulation exceedingly difficult. It is hard to see how one can guarantee that the virus will not be reintroduced to Spain by the holiday trade. Tourism is, however,  a very important part of the economy for this country, so one can understand the intensity of the pressures.