Inside Gardens by the Bay park area, Singapore, there are three main spots that you can visit: Flower Dome, Cloud Forest, and OCBC Skyway. At the time of my visit, I only got time to visit the Flower Dome. Gardens by the Bay is located in front of Marina Bay Sands, you can go here by hopping on a bus or taking the MRT to Bayfront Station, which I think is the more convenient mode of transportation.
