I used to live in the San Francisco Bay Area and here are some of my favorite things to do:
Walt Disney Family Museum. This is a fantastic museum developed by the Disney Family with some assistance from the Disney Company. The museum shows Walt's and his family's life. They've done a fantastic job making this very interactive and interesting. There's a huge model of an idealized
Disneyland that has moving rides. Next to the museum is a special exhibit area that recently (I don't know if it is still there) had an exhibit about the development of the Snow White film. Again it was fantastic. The museum is in the Presidio near the Golden Gate Bridge.
Walk across the Golden Gate Bridge. The views from the bridge of the bay are outstanding. You don't have to walk all the way. It is quite something to be that high above the water and watch ships sail underneath.
Fort Point. This is actually underneath the Golden Gate Bridge. I wouldn't go here so much to visit Fort Point itself, but to watch the surfers, the waves, and breathtaking views of the bridge. Fort Point was built during the Civil War to defend the Bay. It never had to do that.
Get a picnic lunch and go down to the Marina. There is lots of lawn and lots of people. It is fun to watch the people flying kites. The Marina is between the bridge and Fisherman's Wharf.
Muir Woods. This is actually north of the Golden Gate Bridge, maybe about an hour north of the bridge. This is an old growth giant redwood forest. The walk in the cool of the woods is wonderful. The forest chase scene on the Moon of Endor from Star Wars (Ewoks) was filmed here. You can merge this with a visit to Sausalito if you want.
Sausalito, a small town on the edge of the bay with lots of restaurants. Good views of the bay. Can be VERY crowded and hard to park.
Fisherman's Wharf, Pier 39. This is REALLY touristy and can be missed without a problem.
China Town. This is on Grant Street. Find parking near by and do not try to drive through the area. It can be fun. If you want really good Dim Sum, rather than looking for something in China Town I'd eat at Yank Sing in the Rincon Center. (I might have misspelled that.) Dim Sum is described as Chinese tapas. The waiters wander around the restaurant with carts with lots of little dishes. You point at what you want. The pork buns (steamed not baked) are outstanding.
Monterey Bay Aquarium. Monterey is south of San Francisco about two hours. There are a lot of things to see in Monterey but the aquarium is outstanding. It was originally built by Packard money (of Hewlett-Packard Company) but is self sustaining now. There's a two story tank with fish from the Monterey Bay. The window into the tank is two stories tall and worth the entrance. By the way this was where some scenes from the Star Trek movie with the whales was filmed.
Just some ideas to consider.