Whatever deity you believe in (or if you're an atheist, God) has declared that you'll be dead in 24 hours no matter what you do. It/they have also decreed that you get one wish and a request.
What are they?
Your wish can be anything, but God will still kill you when your 24 hours are up. Your request is something that could feasibly be provided to you within the time-span.
Me, I'd go the memorable way:
I'd request a bottle of water and some comfy shoes, then I'd just go for a walk. And wish that there'd be glorious sunshine across the entire globe, but also light rain. As if the heavens had been lit as a beacon to my lost soul, and as if the Earth were weeping at my loss.
Beat that!