It’s called the S.E.A. Aquarium and you can take the train called the Sentosa Express (using your MRT card) from the Sentosa Station at VivoCity (it’s just next to Food Republic). It deducts S$3.50 from your card and you need to swipe it just once and not twice like you do at the other MRT stations. This is more like a tram then an MRT. It’s just 1 stop away and you need to get off at Waterfront Station. From there it’s a 2 minute walk and you just need to follow the signs. The whole place is know as the Marine Life Park and within that is the Aquarium. It’s all a bit confusing and I wish they would just have one name for the whole place but I guess they do this as they want to charge you separately and make more money? Tickets cost S$29 on a non-peak day which I think is rather expensive.
My photos are in reverse order.