Globe Trekker: San Francisco
San Francisco sits in the northern part of California and is generally recognized as one of the most liberal and attractive cities in the United States. Home to the flower power generation and a thriving cultural mix, San Francisco has something to offer everyone.  Follow Justine Shapiro through the communities of Chinatown, Mission, The Castro, Haight Ashbury and North Beach that make up this unusual and thriving cosmopolitan metropolis. Along the way... Visit the Castro neighborhood, a mecca for the gay community.    Meet authentic hippies in Haight Ashbury.    Sample hardcore vegan food.    Visit the famous prison island of Alcatraz.    Take a day trip to see the Giant Redwoods.