You want to include your rubiks cube interest and spit bubbles?... hahaha, I'm sorry, but I'm not sure if this is a comedic joke or something. If it isn't, then let me tell you it is very hard. Unfortunetely, they look for EC's over a long period of time, so starting now, although still fine, won't be nearly as good as, say, playing piano for 5 years. Try to choose EC's that you actually like, not ones that will "get you into prep. school", because if you do that, you won't excel at them, which is another aspect top tier schools look for.