I'd finally stop being lazy and fill that organ donor card.
I'd probably travel and see how far I could go, I'd sit down and draw something on the notebook on my last hour, and figure I could only draw stick figures, and dies. After my death, some wild animals probably eat my corpse along with my stick figure drawings and leave no traces behind, and so I've lived a pointless life, and did not even die a good death, nor left anything behind even if I try at the last second.