The most interesting thing in Space City is its 3D IMAX cinema and its two planetariums. You can definitely spend a whole day there. I visited it on my own - I arrived at eleven o'clock and left at six in the evening with the feeling that I still have things left to explore. There are plenty of movies and organized activities to attend - before you know it you've been there the whole day. As for the food, I recommend taking some from home because it is very expensive there. There is a bus line that connects Space City to the centre and it runs throughout the day.