P.W.
There are a lot of fun things to do in Southern California. Depends on how far you want to go outside of Anaheim, but here are some ideas:
-La Habra Children's Museum
-Santa Ana Zoo
-Irvine Regional Park and OC Zoo (very small zoo, but large park with train ride, pony rides on weekends, etc.) www.ocparks.com
-Pretend City (Irvine)
-A day at the beach (you have many to choose from)
-A picnic at a local park (again, lots to choose from)
-A small "hike" on park-like nature trails in Newport Beach at Environmental Nature Center (www.encenter.org)
-Visit the Koi Ponds in Laguna Beach (it's a store along Laguna Canyon Road)
-Visit the Sea Lion Rescue in Laguna Beach (near Koi Ponds)
-Check for Moms group or Church group events in the local area
-Visit a Rainforest Cafe ###-###-####) or fun themed restaurant
-Aliso Beach in Laguna (small playground, BBQs and cove-like beach)
-Check for local Farmer's Markets (www.cafarmersmarkets.org)
-Go for a walk at Irvine Spectrum (fountains kids can play in, merry-go-round, etc.)
-Go for a walk at a local Mall
-Check out The Great Park in Irvine (hot air balloon to watch or ride, plenty of grass for running, though it's not even close to being fully developed, it's fun to see what they're planning)
-Visit Tanaka Farms in Irvine
-Discovery Science Center in Santa Ana
-Santiago Park (directly across from Discovery Science Center), playgrounds, BBQ pits and lots of grassy areas with picnic tables.
-Aliso and Wood Canyons Regional Park (Laguna Niguel) - includes 3,400 acres of wilderness sanctuary with trails and the adjacent Orange County Natural History Museum. Ages 2+ and it's only $2 for parking/admission.
-Fullerton Arboretum (www.arboretum.fullerton.edu) - ALL ages
I hope this helps!! Have a GREAT trip...
Best wishes,
-P.