We first went into the flower dome and Tulipmania is currently on display. There was a wide array of tulips in every color arranged in the middle of the atrium. Expectedly there were also hoards of tourists milling about in the area, that was the only negative thing I experienced. Just way too many people. Maybe a scheduled viewing would help in the traffic of people. This was an issue for me because you can't fully enjoy the beauty of the flowers and plants just because its packed to the brim. But other than that, the greenhouses were very well maintained and the staff were all so helpful and answered questions with a smile on their faces, such a treat after dealing with the staff from the Singapore Zoo where almost everyone was scowling.
We also went into the Cloud Dome and this was by far the attraction I enjoyed the most. Upon entry, you're welcomed by the waterfalls and a cool breeze and as you walk around and make your way down from the top, you get a good view.
Unfortunately because of the bad weather, the were not able to do the walk along the Supertrees.
Overalll it's worth seeig and going to the attractions at the Gardens by the Bay. The tickets are not cheap but its not too expensive either given what you experience, its more worth your money than doing Universal Studios.