Plan your last day on Earth.
I see this question in two ways!
If given a chance to decide the date and time of the last day on earth, then it would be 40 years from now! 😉 Though I don’t know what date God has decided for me, I trust God will let me know when the day is around.
The next thought that came to me is the actual planning! How I plan to leave the earth?
I would keep a Thank You Note to all my loved ones!