I know there's already Disneyland there, plus Ocean Park and Madame Tussaud's Wax Museum... plus all the streets catering to sports, gadgets, clothes, etc.
But just in case you're thinking of what else to do in Hong Kong, you might want to bring out the inner child in you again and go spend a half day (or whole) in one of its museums (or two).
One such museum that is a must-visit is Hong Kong's Science Museum. I like to believe am no geek but you could easily lose yourself in all the things they have there that's educational, amazing and just plain mind-boggling.
They even have this one area where there are just all these puzzles for you to work on. You'd just really feel like a kid making all these new discoveries! What's more, you're not going to be graded so no pressure to perform well.