H.D.
My kids LOVED the Aquarium of the Pacific http://www.aquariumofpacific.org/ they also had an absolute blast at the Discovery Science Center http://www.discoverycube.org/ and the other thing we did was eat at Medieval Times http://www.medievaltimes.com/ Make sure you get tix in advance for the show as they can sell out quick during peak times of the year.
Enjoy your trip!