Science museum, housed in a spectacular green building in the water next to central station. My kids think its great and my parents thinks its the best science museum they've been to. Avoid during school holidays if you can, it gets very, very busy. Great views from the cafe. In the summer, for some odd reason, they cover the terrace with sand and turn it into a "city beach". An odd trend. I've never quite understood the urge to get sand everywhere when you can't dive into the sea.