The Aquarium of the Pacific, located in Long Beach, has a promotion on between now and March 31 2010. We have discount coupons good for one free child's admission with one paid adult admission. Quantities are limited. We will have them available at the front desk until they run out or expire, so be sure to ask about them next time you are in.
I went to the Aquarium of the Pacific a few years ago and had a wonderful time. While it is not as fabulous as the Monterey Bay Aquarium, it is quite the facility. The moon jellies and shark-petting pool are my favorite exhibits!
LA Metro can take you down to Long Beach if you don't feel like driving all that way and hassling with parking. From the Valley you take the Red or Orange line bus to the Red line subway, into downtown, then take the Blue line (light rail) to Long Beach, where local shuttles will get you around.
If the economy has forced a change in your plans and it's a "staycation" this year, the Aquarium would make a perfect holiday excursion.