Back in the middle '80's there was a movie called "Miracle Mile," about the world ending in a day. It was an interesting take on what most people would do. What would you do if you knew the world was going to end in 24 hours?
Myself, I'd get a bottle of good brandy, a box of fine cigars, and take my rocking chair out to a deserted lake, put it under a shade tree, and smoke and drink until it ended.
Some hash and opium would be nice, too.