I fully agree with the positive reviews already posted about Butterfly Wonderland. It's a well-designed and well-executed display of the life cycle and habitats of butterflies, and the atrium was very enjoyable (although it would probably be more tranquil mid-week during the school year). I've been to a few other, similar facilities in the US and overseas, and I believe it's on a par with any of them.
My only complaint? It's overpriced at $18.95 per adult and even at $16.95 for discounted admission (senior, military, AAA).