My 9 year old boys enjoyed the Kim Possible missions, but my 5 year old girl was very bored. The character on the phone talks for quite awhile before giving you the clue. She would lose interest quickly and want to climb on something nearby instead. She had more fun when we bought the $10 passport at the gift shop when you come in and then got it stamped at the countries. They write the child's name in the language of the country. My kids thought it cool to have their name written in Chinese!
There are a lot of fun things for little kids. The miniature train set outside of Germany was a big hit for my 5 yr. old. They also liked all of the shows. The drum and bugle one at U.S., and the chair stacking one in front of France. They loved the shops at China and Mexico. There are cute puppets and hats to try on. The Mexico and Norway rides were fun for everyone.
I thought Kim Possible was fun, but 5 and under, depends on the patience level of your child.