Personally, I think my dandruff is caused by a history of eczema, shitty New York tap water, and chronic bad juju. After my traumatic episode, I searched the racks of Duane Reade for any type of drugstore-brand scalp treatment, when I came across a familiar face: tea tree oil.
From Midtown or the Village, take the F or D trains that run down Sixth Avenue from Central Park to Washington Square or the N or Q trains that run down Broadway to Canal Street. All four of these trains will take you directly to Coney Island in Brooklyn.
Well, you're probaby not going to go to ALL areas that the subway goes to. That's pretty ambitious. You're probably going to stay in Manhattan, and probably only see midtown and lower Manhattan. Perhaps also the UES or UWS if you're planning on going to the Met Museum or the Natural History Museum, respectively.