California is a large state with many different areas that are good for kids. Here are some areas that are often recommended for families with children:

San Diego: San Diego is known for its family-friendly attractions such as the San Diego Zoo, Legoland, and SeaWorld. The city also has many beautiful beaches and parks that are perfect for kids.

Los Angeles: Los Angeles has many family-friendly attractions such as Universal Studios Hollywood, Disneyland, and the Griffith Observatory. The city also has many parks and beaches that are great for kids.

San Francisco Bay Area: The San Francisco Bay Area has many family-friendly attractions such as the California Academy of Sciences, the Exploratorium, and Six Flags Discovery Kingdom. The area also has many parks and beaches that are great for kids.

Orange County: Orange County is known for its family-friendly attractions such as Disneyland, Knott's Berry Farm, and the Newport Beach Pier. The area also has many parks and beaches that are great for kids.

Sacramento: Sacramento has many family-friendly attractions such as the Sacramento Zoo, the California State Railroad Museum, and Raging Waters Sacramento. The city also has many parks and outdoor recreation areas that are great for kids.

It's important to note that there are many other areas in California that are also great for kids, and the best area for your family will depend on your interests, budget, and lifestyle.