SCVNGR is an app where you can build scavenger hunts for your students. Once built, your students use the app to complete the hunt, taking pictures along the way. This would be a great way for student in world language to practice/learn the command form (encuentren un árbol, siéntense debajo del árbol) and also to learn new vocabulary. They could do it around campus. It also gets them up and out of the classroom.