Put your arms around her waist & whisper in her ears.

Kiss her every chance you get.

Hold her close when she's cold & she can hold you too.

When you are alone hold her close & kiss her.

Kiss her on the tip of her nose (it will give her the hint that you want to
  kiss her).

While in the movie, put your arm around her & then she will automatically
  put her head on your shoulder, then lean in & tilt her chin & kiss her lightly.

When she complains that her neck/shoulders hurt/s, massage it/them for
  her.

When people diss her stand up for her.

Look deep into her eyes & tell her you love her.

Lay down under the stars & put her head on your chest so she can listen to
  the steady beat of your heart. Link your fingers together while you whisper
  to her as she rests her eyes & listens to you.