Right, ignore everything you've just read (except what MebeJedi said), don't show off about how you went ice climbing or any of that crap and don't try to be in the same place at the same time or whatever because that is stalking. Here's what you need to do - be yourself. If she doesn't like the real you then who cares? Go up to her, say hello, have a chat. Do it before she leaves because you'll regret it if you don't. If it all goes wrong and she thinks you're an idiot, in 100 years, who's gonna care? In fact, in 6 months who's gonna care? Nobody. But if you don't try you will never know. So just keep it simple and say hello and see what happens.