If you had only 24 hours left on planet earth, how would you spend it?

Establishing good communication methods with the next place am going too. Could be another planet.

kissing and hugging my wife, kids and loved ones

With my family, enjoying some Top Shelf Single Malt and the finest cigars in my humidor.

making sure that plenty of underserving people would not stay on Earth any longer than I.

In my undergraduate thermodynamics course, because it would feel like an eternity. (as the joke goes)