We found this wonderful museum two years ago while taking a family vacation to Disneyland. It does get crowded, but is so much fun for the kids. We travel down south about five times a year, and my kids are always asking to go back to the museum. In my opinion it is perfect for all ages. Be sure to go to their website and look at the upcoming exhibits. Last year was Bob The Builder and my 1 year old was beyond excited. This year is the Magic School Bus.
The outside Dinosaur exhibit is wonderful and lots of fun for the kids. My youngest loves sitting on the little dinosaurs and taking pictures.