Mapping a piece of music visually and/or through movement can be an effective way to help children understand its formal structure. Here are some ideas for mapping a song.

1. Give each student a piece of paper. Have them place their finger on the paper at any spot where they would like to begin. Sing the song and let everyone draw and imaginary line to represent the melody. There is not right or wrong answer here. Next, have everyone place and "x" at their starting point and then sing and draw. Once more, without drawing, have everyone retrace their map with their finger while singing. Next, ask everyone pass their map to their neighbor and see if they neighbor can follow their map. Encourage the students to "make it work." It made sense to their neighbor, so ask them to walk in their neighbors shoes as they follow the map. You can keep trading maps for as long as students are interested. 
2. Create your own melodic contour maps. Here's an example from Teaching with Orff. These can be drawn on butcher paper or poster board. Have the students track the contour in the air with their fingers while you demonstrate. It can be effective to divide these maps into separate pieces of poster board and then have then students place them in the correct order. 
3. For classical music, you can use pre-designed listening maps. Here are some examples of digital maps from Frau Musik.