Free Day at The Huntington
To take advantage of the Huntington's free day program, you must reserve tickets in advance; see the website for full details. Once you have your reservations, you can enjoy the museum's 13 gardens for free - including the popular Children's Garden, designed especially with kids ages two to seven in mind.
Packing a change of clothes may be a good idea, since the many squirting fountains and misters amid the mazes and underground tunnels are pretty irresistible.
Check out other free museum days in LA and OC.