Pier 39 is a popular shopping and entertainment destination located in San Francisco, California. It features a variety of shops, restaurants, and attractions, including street performers and an aquarium. Visitors can enjoy stunning views of the Golden Gate Bridge and Alcatraz Island from the pier. One of the main highlights of Pier 39 is the resident population of California sea lions, which can often be seen lounging on the docks. The area also hosts seasonal events and festivals, making it a vibrant spot for both tourists and locals to explore and enjoy the waterfront atmosphere.