The Fort Wayne Zoo is surprisingly good, RL. I was there with my family about 6 years ago and we enjoyed it immensely. It's probably a little closer to you than Indy and a lot less interstate driving. There's also a nice Science and Industry Museum there in the city. We did the zoo one day and the museum the next and felt like it was worth the trip. The Convention and Visitors Bureau there has a package deal
on discounted tickets to both places, as well as the Wizards baseball team.