If you visit Cincinnati, might as well visit the Cincinnati Zoo and Newport Aquarium right across the river. They have great collection of fauna living in walk-in living forest environment. The Aquarium has some pretty good planted tanks too.
The Krohn Conservatory used to keep unwanted Iguana but I think they got rid of that idea. I guess they were eating the exhibit.
Yeah Iguana's can be pretty destructive with plants. I am planning on taking a day in Cincinnati, I pass thru there usually once or twice a year on my way to Florida- depending if I drive or fly. So a stop at the Zoo and Aquarium...as well as the conservatory would all be high on my list. Plus my kids would love all those places.