San Francisco became the Valley of the Giants for the third time in five years Friday as tens of thousands of people lined the streets for a confetti and rain-soaked parade honoring the city's World Series champions. Under gray skies where a steady drizzle mixed with clouds of orange, black and white confetti shot from sidewalk cannons, players waved, snapped photos and mugged for the roaring crowds from the top of double-decker buses, a change from the classic convertibles and cable cars on wheels that had transported them along their now-familiar parade route in 2012 and 2010. ''These guys play together, they believe in each other, they play as one and they never give up,'' baseball Hall of Famer Willie McCovey said as he waited to greet the young members of his former team for a ceremony at San Francisco City Hall, the end of the 2-mile route. ''I'm going to send them to school on Monday saying they had 'orange fever,''' said Marcela Habash, 36, of San Francisco, who brought three of her four children to the plaza outside City Hall to see the celebration.