Sutter's Fort – Outside the Bay
Another great spot to visit for kids interested in California history is Sutter's Fort in Sacramento. Many of the rooms of the fort have been restored to demonstrate their original purpose. The fort isn't large, and we took our time exploring and reading signs, even revisiting spots that the kids wanted to go back and see again, and still finished in les than two hours.
Our kids liked being in charge of the map and looking up the purpose of various areas of the fort. There is also a lot of open space in the center of the fort for little legs that need to let out some energy in running around before they can pay attention to the history again.
Admission is $5 for adults and $3 for children, and kids under 5 are free. The State Indian Museum is on the same grounds as Sutter's Fort, just outside the fort gates, and I believe a discount pass can be purchased if you plan to visit both places. We did not go into the State Indian Museum, but would like to go back to do so.