This coming long holiday weekend, April 29-May 1, the Green Blue Path (Sentiero Verde Azzurro) will again be one-way hiking from 10:00am to 2:00pm. in the direction Monterosso to Vernazza. This is a safety measure by the National Park of the Cinque Terre to avoid dangerous overcrowding on the narrow trail. The same measure was implemented on the recent long Liberation Day weekend.
Anyone visiting the Cinque Terre is advised to visit the Park's website beforehand to check for trail closures and restrictions: http://www.parconazionale5terre.it/Edettaglio.php?id=74043
That is one sad announcement showing the state of tourism in the world. It's a race to the bottom of the bucket list.