The most symbolic of San Francisco attractions is definitely the Golden Gate Bridge, so if you're wondering what to do in San Francisco, the first on your list should be a visit to take in the views. Its 1280 meters of road linking the peninsula from San Francisco to Southern Marin and can be crossed on foot via the pedestrian lane, by bike in the separate cycling lane, and by car in one of the other 6 lanes designated for cars. The view of San Francisco Bay from the bridge is amazing and is one of the most picturesque places to visit in San Francisco.
One of the other interesting things to do in San Francisco is visiting the world famous Alcatraz Prison. Known for its history and the many films based there, this jail located on the island of the same name is one of the most important attractions in San Francisco and you can find a variety of daily tours. To get there, you have to take a boat at Fisherman's Wharf.
Does Lombard Street ring a bell? It's the street that's most often seen on television. It's so steep and curvy, it's scary! Make sure you check it out because a photo-op on the world's curviest streets definitely makes it one of the most iconic things to see in San Francisco.
More stuff to do in San Francisco includes visiting prominent neighborhoods like Chinatown, the Castro, or Alamo Square which house many of the top sights in San Francisco. In short, there are tons of fun San Francisco activities, as you'd expect from one of the most popular and well-known American cities.