It was such a surprise to find this lovely, quiet garden in the middle of San Jose, that I almost didn't believe it could be where they said it was. So I got a taxi to the garden (about $2) - although I walked back to my central hotel in about 15 minutes. I can't really do justice to the delight of experiencing the air full of butterfies of all colours and shapes and sizes. I sat still on a bench for a while and several came and perched on my arms. About the only thing missing from the experience was the perfect music - if I went back I would take an MP3 player with something classical.
I was greeted by a very friendly woman who explained the covered garden and the uncovered walk to the river that is also available (I enjoyed that too), and I was given material to identify the butterflies as I saw them. They also have a video and it was apparent that I could have a more 'scientific' experience if I wanted it, although personally I was content with a more sensory experience.
There was also a cafe which looked very pleasant, and if I had realised it was there beforehand I would have left more time to enjoy that too.
Later in my visit to Costa Rica I visited another butterfly garden just out of Jaco, but this one was very much better.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC