I will have the moral courage to make my actions consistent with my knowledge of right and wrong.
Job 27:5 "Till I die I will not remove mine integrity from me."
Play charades or a guessing game using famous individuals who were outstanding examples of integrity. Some examples might be Joseph Smith, the Savior, Abinidi, or Daniel (in the lion's den).
Have the girls go around to different stations. At one station there may be a senario where your friends are telling jokes you find offensive or you're invited to see a PG-13 movie with only a few swear words and one 'bad' scene. based on the choices that they make, reward them accordingly. Emphasize that they need to stand as witnesses of God at all times and in all things and in all places. (This could also be used under the theme of Choice and Accountability)
Tell the girls to bring a story to share that illistrates integrity and to bring a food that's mentioned in the scriptures. Then drive to a nearby park and have the girls sit in a circle on the grass and share their stories.