If I could give a certain answer to that I would be beyond rich and famous. My opinion however, is that you are here to experience and learn everything you can during your life, no matter how short or long it may be. The best way we can use our time here is to gather and analyze as much information about our surroundings as possible. Everything on this planet is so strange and fascinating, especially the actions of our own species. To live without observing life would be a waste.