I would be a short bishounen, first of all, which I would take complete advantage of. I'd dress nicely and enjoy not having obnoxious boobs.
I'd go tell sad girls how pretty they are, because they believe it more when it's from a cute guy. So I'd go charm people and help them carry heavy crap. With my shirt off.
I would deeeefinitely ask my guy friends and other guys about junk I can't ask them as a girl. I want to be knowledgable about males when I'm a girl again.
Oh, I'd kiss a girl. I've heard we're better kissers than men, and I am prone to believing this rumor. I think girls think way more about how they're kissing.
I would definitely examine my penis like a lab project and then blush and put it away. It'd probably be little, based on stuff.
Then I would roll down hills and chest bump people and sleep on my stomach just for the gigglez and lack of inevitable titty-squashing that occurs when I'm female.