If you do visit Gardens by the Bay, plan your visit such that you are still around during the 7pm “magic hour”. As the skies changes its hue, the Supertrees start to light up, and the resulting light show is spectacular. Find a seat somewhere, just relax and take in the sights. You could also hop up to the OCBC walkway, which links two Supertrees together.
Edit: Mango yellow background. Hm. Interesting color.