The water cycle. Drip the water drop and his adventure through water. This would good for older students. or grade. This could also be tied into a social studies lesson in order to help understand what is going on as Drip travels along the water.
Once they start moving more into larger maps and globes, first graders could easily label this map and color the land and water blue and green. This would be a good activity for teaching students how to label maps.