Cubans carry photos of Revolution leader Fidel Castro on the occasion of his upcoming 90th birthday in August, next to a photo of soccer player Lionel Messi during a march celebrating workers day, at the Plaza de la Revolucion, on May 1, 2016 in Havana, Cuba. Cuba celebrates workers day shortly before the arrival of the first US American cruise ship to arrive in Cuba, on Monday, May 2, 2016.