For one day, you become Batman. You have access to everything Batman has in his inventory, as well as other gadgets and equipment. (Batmobile, the Batwing, etc.)
What do you do?
I'll run up to everybody's face in the city and say "I'm Batman" to them.
EDIT: Then I'll take Wonder Woman to some fancy restaurant and stuff.
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Take down all forms of criminals, from warlords to petty jaywalkers. Have you seen what Batman can do in one night?