The Gardens by the Bay at Marina Bay South is open for preview in conjunction with the 20th World Orchid Conference. A ticket to the Orchid Conference will entitle you to a preview of the Flower Dome at the garden as well.
If you are driving, just head towards Marina Barrage. You have a choice of paid parking at one of the carparks at the Garden itself, or you could park for free outside Marina Barrage, though the walk to the Gardens will take about 15 minutes.
I love the work of art that is Marina Bay Sands. As soon as I realised that I could see it from about almost everywhere around town, I have been wanting it as the view from out my bedroom window :')
If you arrive at the Gardens By The Bay after nightfall, the main attraction would be these SuperTrees, all lighted up in changing colors.
Another pair of eyes which reminds me of the Esplanade would be the Flower Dome and the Cloud Forests. Since we did not manage to preview the interior of the Flower Dome, we could only admire it's external structure. See those posts along the path? You might want to use them as tripods to capture a picture of the Singapore Flyer in the background.
Stay tuned for the Gardens by the Bay in daytime. Or you might want to pay the place a visit yourself this weekend.