Just be yourself. You don't have to do or say anything that makes you feel uncomfortable (Chances are she is probably attracted to you just when you are nobody else but yourself).
Talk about your hobbies or favourite music. Tell her how you think it maybe interesting to watch a movie where Jet Li fights Johnny Depp and your impression of how the fight will go (I would want to see a movie like that).
I think being mellow is a good start. Show her complete coolness in every action, every topic and every conversation.
Hope above helps, good luck!!!
Don't cry, don't regret and don't blame
Weak find the whip, willing find freedom
Towards the sun, carry your name
In warm hands you are given
Ask the wind for the way
Uncertainty's gone, your path will unravel
Accept all as it is and do not blame
God or the Devil
~Born to Live - Mavrik~