To begin the lesson, I am going to tell them about a group of girls that one night all divided up into cars and decided to go to the temple. Instead of using maps or directions, they would simply flip a coin at each intersection. (post here). I will stress the importance of not leaving our temple preparation up to chance. I'm also sure that many in the car knew the way, and knew that the coin was telling them to go the wrong way. In the same manner, it is important for all of us to follow the teachings and commandments of the gospel.
For my handout, I took a picture of the temple from LDS.org. Using Picasa (it's free) I wrote "Wish you were here." I am going to mount each picture on card stock to make postcards. Then I will have each girl write a postcard to her future self.
Here's an example of the Salt Lake and San Antonio temples.
Click here to see other YW lesson ideas.