Well, if I were to hypothetically have 24 hours from 12:00 AM...
Spend most of the day with my family, friends and boyfriend, doing just random activities and such.
At about 8 PM, I'd put on some headphones and listen to all my favorite music one last time, until about 11:00. Next 45 minutes. I'd say all my goodbyes to my loved ones. Last 15 minutes, I'd probably don the headphones one last time, and wonder about what comes next, if anything.
But, I'd also probably be in a complete mental breakdown by that point, I don't think I'm strong enough to keep a calm demeanor for my death.🙁