yes i have done it and enjoyed it. Not sure there will be much to entertain youyr 2 y/o thought. My son( 9 at the time) enjoyed it. It is very educationally focused and you have minimal intercation with the animails- you get to touch a penguin.
If you have any specific qustion i'd be happy to answer.
We did this in April of 2005 when DS was 1 1/2yrs. We did get to carry him with us. They even let us bring his stroller. We just had to fold it up for the part where you ride the bus to get to different sections and we had to leave it outside when we went in the buildings. They even let him pet the penguin with the help of my husband. We had a blast on the tour and I highly recommend it.