Probably wouldn't do anything, because there are so many insane people in this world, I'd be too busy fortifying my house, and making sure I survive the day, than consider criminal acts I might commit. If it was like an annual thing, I'd invest in a hell of a panic-room and just sleep through the day.
Besides, unless you're already suffering from some sort of deep-seated pathology, or serious anti-social tendencies, chances are breaking laws for the heck of it will actually harm you more psychologically speaking than it will provide you any sense of catharsis.
So, it seems like a waste of time.
If I didn't have to worry about all the psychos, I'd probably break some drug-related laws, and trip on LSD, DMT, or mushrooms (or maybe all of them). These seems relatively harmless to do, and won't negatively effect anyone else.
All that being said - some sort of kill-game, or free-for all martial arts/survival game in the woods, or on an island, similar to Battle Royale, but only between consenting adults, is something I'd be in favor of, and might even consider participating in if I ever contract a deadly disease.
Seems like good fun. With the exception of the use of slaves, the roman gladiator matches are right up my alley as entertainment.