I am planning to fly to SG during holiday in April. Beside of Universal, is there any activity place that suit for 3 years old girl?

Go to the Aquarium! Kids love that, no.. even adults love see fish swimming and we feel like we're underwater. Calming yet refreshing. Go check here> http://www.rwsentosa.com/Homepage/Attractions/SEAAquarium Sometimes there are promos for the ticket. Enjoy your holiday!