I agree with hankster. I know you're doing a 1/2 hour train ride, but I would set it up as coffee. That way, if you're totally repulsed by her appearance or something you haven't wasted a lot of time. (Not that looks are everything, but there's got to be some chemistry or it won't work.) Then, if you're really hitting it off, after the coffee you could suggest something else, like the museum, etc. I wouldn't lock myself into a whole-day affair with someone you've never met.