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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I'll go around and tell everyone I'm batman in that deep sandpaper voice. Then I would teabag the statue of liberty then fly off into a boat and then say BATMAN and jump into the water killing myself returning back to my normal self. Lol