I would try out, and feel how sex feels like for a girl, both with other women and men. (I have no issues with sex with both genders since I'm Bi).
I would try to manipulate men into doing what I want. (Use my gender for profit/personal gain)
Dress like a pretty women. (Hey, If I have a female body for a day, I would surely try dressing like a beautiful women.)
pretend i'm a Fem-Natzi for 1 day.
Go on a few online games i play and say i'm a girl/women in chat, then prove it with a microphone/voice chat. Then reject everyguy trying to make "advances" towards me.
Since i'll be transforming back to a guy after the day is over, I might try and rob some stores?
Can't think of anything else for the moment :3