By Rory Carroll SAN FRANCISCO, Oct 30 - Fans of the San Francisco Giants took to the streets to celebrate on Wednesday night after their team won the baseball World Series, topping the Kansas City Royals, but the festivities were marred by raucous fans and fires. Hundreds, many clad in the team's orange and black, flooded Valencia Street in San Francisco's Mission District after the final out in the seventh game of the baseball championship. "(Pitcher Madison) Bumgarner blew my mind tonight!" said Beau Adams, a San Francisco native sporting a Giants tattoo.