The park is wonderful for young kids. To promote/extend your kids fascination with dinosaurs , there are a writeup from USA Today, Best new dino-themed iPad apps for kids:
My kids absolutely love Dinosaur Park and I honestly wish I liked it more. I has everything a child dreams of at a playground: big slides, sand, prehistoric fossils to climb on, a large hill to ride scooters on, water fountains (when they are operational) and more.
I like the close bathrooms, the beautiful flowers on the walk up the hill and the fun play equipment. I have found myself riding as a passenger in the big pretend Jeep, and playing in the water and sand along with my kids.
When my kids were younger (under 5), I could keep them with me on one level of the playground (which is split in two by stairs and a hill). But now that they are older and more independent, they are out of my sight for most of our time at the playground, and my younger ones love to follow them.
It's a great playground to visit and enjoy, but be aware of the split level that can keep kids out of eyesight of parents. Bring sand toys for sand and water play. Enjoy!
This park is very cool! It has cool fossils for the kids to see and it's right next to the community center so if your kids need to go to the bathroom it's really close by. This park is nice and clean but it's pretty busy on the weekends so try and go during the week when it's not busy :)
Dinosaur Park in Laguna Hills is pure prehistoric fun. I've heard it called Dino Park and the official name is Prehistoric Park. The kids love the climbing on the whale fossil and going down the double metal slides. Some parents don't like it because it's on two separate levels so it's hard to watch multiple kids. Older kids especially love it. Read more on FunOrangeCountyParks.com.