We know this is cliché, but it’s a must see. It’s a great walk or bike ride for the rare day that it is sunny out. It obviously is the most well known San Francisco Photo Opp.
Pier 39 and Fisherman's Wharf is a staple in San Francisco. Everyone needs to come see the Sea Lions. You can see them fight, be lazy, and sing the song of their people. Watch as they bask in the sun showing off to the people of San Francisco and how lazy and loud they truly can be.
Pier 39 is also somewhat of a tourist trap, however, if you have never been here it is always fun! After sharing a moment with the resident Sea Lions of Pier 39, there are various places to buy San Francisco themed trinkets, candy shops, and places to grab a bite to eat. Perhaps you can grab a steamy hot bowl of clam chowder in a sourdough bread bowl to cure your cravings.
Traveling with kids?  California Academy of Sciences is great for people of all ages. Located in Golden Gate Park, you can hit two San Francisco tourist birds with one stone!
The California Academy of Sciences has a full aquarium with various sea creatures, even ones that you can hold and pet! There are also different animals such as penguins and the resident albino alligator Claude to come and marvel at. You can even step inside the academy's living Rainforest which is four-stories tall and is home to free-flying birds and butterflies.