The San Francisco Tube is worth taking, the one-way ticket costs $7, but it is a lot more cost-effective to buy a one-day and multi-day pass (including San Francisco bus). We are taking the Fisherman's Wharf from Union Square, and there are many angles to enjoy the city of San Francisco along the way. If you want to hang on the outside of the brake, you must pay attention to the safety of the car to close the car, do not hang outside with backpacks, otherwise it is easy to encounter the car parked on the street or driving on the road, and pay attention to whether there is a car behind when you get off the bus.