People take photos on the beach of the Vistula River in Warsaw, Poland on May 2, 2026. People relax and enjoy the late-spring sunshine along the bank of the Vistula River during Poland's "May long weekend," which runs from International Workers' Day on May 1 to Constitution Day on May 3. (Photo by Jaap Arriens/Xinhua)

People relax on the beach of the Vistula River in Warsaw, Poland on May 2, 2026. People relax and enjoy the late-spring sunshine along the bank of the Vistula River during Poland's "May long weekend," which runs from International Workers' Day on May 1 to Constitution Day on May 3. (Photo by Jaap Arriens/Xinhua)

People play beach volleyball on the beach of the Vistula River in Warsaw, Poland on May 2, 2026. People relax and enjoy the late-spring sunshine along the bank of the Vistula River during Poland's "May long weekend," which runs from International Workers' Day on May 1 to Constitution Day on May 3. (Photo by Jaap Arriens/Xinhua)