Go out of the way for her

Girls love it when a guy will go out of the way for her to do something. Instead of going to the ball game to hang with the guys, Go to the top of a mountain and watch the stars with her. Tell her, "This place is so beautiful. Every time I go here it reminds me of how lucky I am to have such a cute and wonderful person like you in my life."

and then Kiss her, she will eat it up!