Take the kids on a drive thru safari at Wildlife Safari.
You can drive your own car through the park to see the animals. The park recommends you should allot about 1 and half hours for the trip.
Try to get the kids to identify the animals. Once you've identified one, look it up on the internet and read about it to the kids. Or better yet, have the kids read out loud to the group about the animal.
Last Bit of Advice
Pack some snacks and take your time getting through the park.