One of the first areas we were in had a cool little cave through which the boys could walk and see some of the exhibits. Jacob was really happy to play around in there:
There was also this very neat aquarium with a little cove the kids could enter, and they could look up at the fish:
They were very well-behaved up until 1:00 or so when we left, then they both zonked out in the car. Jacob and I stopped by REI in Bloomington and picked up some new sunglasses for him, which he really enjoyed.