YES. My new favorite thing to do is to go to Crema Cafa (or any other place I suppose) and sip a coffee while walking through the gardens. So relaxing. And for free!
The gardens are friendly for studying, though I am not sure of the wifi situation. Great for kids' field trips. Great for adults just doing their thing. I went and cartwheeled around their big center lawn. Nobody even looked twice!
I have not been through the butterfly exhibit because the gardens are good enough for me. I will be saving the butterflies for a rainy day.
If you get a chance, check out the HUGE hibiscus like flowers. They are my favorite and makes you feel you are at least a bit closer to Hawaii...the humidity helped as well though.