In April 2005, my DD (6 years) and I took the polar bear tour. It was a great experience for her. Though she didn't get most of the behind the scenes filtration system and such, she loved seeing the animals (bears, seals) backstage and asked many questions about the bears. The guide was wonderful not only with my DD but with the other 9 kids on the tour (aged 5 to 11). All the kids had fun. The highlight? Depends on who you asked, but petting the polar bear pelt and the other 'touching' experiences rated highly amongst the kids I spoke with.
Regards
Natalie Aked
Canberra Australia