Sentosa’s S.E.A. Aquarium is the world’s largest and is home to thousands of marine life species. An open tank behind the world’s largest acrylic viewing panel showcases rays swimming in formation and playful sharks biting each other’s tails. With its dolphins and myriad jellies and other wonders, the aquarium is a great outing for the kiddos, but go on a weekday morning to avoid the crowds. www.rwsentosa.com