One of the nights we went to a karaoke place located in Orchard, where we spent around 3 hours singing together. This was one of the most entertaining activities we enjoyed in Singapore with a more friendly price compared to other location that we've been to.
A variety of culinary places to eat ranging from Singaporean food to other culinary delights such as Japanese, Indonesian, etc all with a tweak of Singaporean taste. I would recommend going to these places with friends to have company and entertainment.
We visited the newly open Rainfroest zoo, with a lot of animal attraction like tigers, spider monkeys, and more. But there are more activities to do such as rock climbing, bungee jumping, and more.