Rule #1 of Girls:
Never ever say it out loud, but make sure that deep within their subconscious, they know without a doubt that you will do anything in the world for them. Sometimes this means you may have to do things like bike all the way uphill from the ballroom to mudd academics with a girl and her skateboard linked to your shoulder, but the happy faces every time you meet and hugs and smiles alone are more than worth it.