I'm going to join the somewhat long list of reviews from folks who came here for an event. I was at a conference at Case Western and we had an evening reception at the Botanical Garden. After some noshing and a few awards, we were invited to check out the greenhouses.
The standout for me was the Rainforest. It's really quite lovely, particularly the upper deck level (accessible via stairs OR elevator!!). We saw a little bit of everything from some lovely plants to random animals and birds (the ducks are super friendly and quite photogenic).
I'm not sure I'd go out of my way to come back, but it was certainly a lovely event and enjoyable tour of the greenhouses.