Not surprisingly, the Norton Simon does not have the extensive gardens that the Huntington does, but it's art collection was wonderful. You can browse the Norton Simon website to see what they have.
It's been a long time since I saw so much great art in one place! When I was growing up we visited the National Gallery in DC many times so I got spoiled by it's abundance of masterpieces.
If your travels take you to Southern California, I highly recommend a visit to Pasadena to see this museum and also the Huntington complex.