Ever since Levi Strauss invented denim jeans here during the Gold Rush, San Francisco, with its cable cars, coffeehouses, and counterculture has been on the cutting edge of cool. From bustling Chinatown to bohemian Haight-Ashbury, the City by the Bay has long been known for its openness and tolerance. It's also a city of freebies. Here is a list of free attractions to help you experience the city without breaking the bank.