Magic Mountain is located in Valencia, CA and currently holds the record for the most roller coasters at any theme park in the world. This is a great park choice for thrill seekers. There is also a seasonal water park on site that requires a separate entrance ticket.
Six Flags Magic Mountain
Discovery Kingdom is located in Vallejo, CA and offers three areas for kids. This park is perfect if you have little ones in your family, not just because of the kid areas, but also because of all the animal interactions the park offers.
Six Flags Discovery Kingdom