The event is in fact predicted to begin on the 21st on the international date line, and progress around the world, so the place to be would be on a cruise ship on the East side of the line so you can observe the beginning of the end, and still have 24 hours to do whatever it is you think you should be doing in your last 24 hours on earth.
This brings about some conundrums for the average bloke. If God is sufficiently annoyed with us as to destroy the whole world, then some last-minute sin and debauchery will probably not affect the ultimate outcome much. On the other hand I've heard it said* that if you repent at the last minute, then after an agonizing death under the hot lava, you get full medical benefits and a harp.
There is also the specter of a heavenly bureaucracy at work:
Camping’s followers believe many will die in earthquakes on May 21, but the world will go on for another five months before it’s destroyed on Oct. 21.Which goes along with the story that the world was to be destroyed Jan 1, 1000 AD, but the paperwork is still being processed.
So go visit your favorite drinking establishment this coming Saturday, and start a tab. If the world ends, you drink for free, and if it doesn't, you pay the tab happy to be alive. It's a no-lose situation.
*Might make a good line in a rock-n-roll song, no?