If it was my last day on Earth, I would spend it with my family, doing my favorite things. Most of the posts people are posting say things like, "I would go to the moon" and "I would take a plane to so and so city." Why would you not want to spend it with your family? My family is the most important thing to me in the whole world. Even my cats, bird, and dog. That's what I would do if it was my last day on Earth.