I'm near the Columbus Zoo and their Wildlights display is pretty impressive. It's a family tradition here. (I have not been to Cincinnati's Zoo Lights to compare.) There are millions of lights, including some that are synced to music. There's also hot chocolate/wassail, Santa, cookies, model trains, etc.
The indoor animal exhibits are open, but the outdoor exhibits are not lighted so most of those animals are either off-exhibit or difficult to see. You really go for the lights, not the animals.
The only thing I'll mention is that they are currently predicting rain here for next weekend. The temperature is predicted to be unseasonably warm, but wet. The lights will be on rain or shine, but the weather might not be the best. (Or maybe they'll change the forecast by then. You never know around here!)