In the airport, there were wonderful orchid gardens with fish ponds and an outside garden walk as well as a beautiful butterfly garden!
I also found a cactus garden and pub with some Optunia sp. that reminded me of my time working on the short grass steppe in Colorado.
On the "return" leg of my trip, I had over a 6hr layover which gave me enough time to visit the country on a free tour. A group of about 30 transit passengers (i.e. with a long layover) got to view a few sites including the Merlion Fountain and the Malay Heritage Centre.
It was an amazing introduction to the place and made me want to go back - I am planning on returning soon for a longer stay!