Walking Audio Tours
An easy entry point into augmented reality can be had by developing audio essays linked to physical spaces. Basic geotourism web sites make creating guided tours delivered on mobile phones easy. Tours include audio that places when arriving at a location. This creates authentic avenues for audio composing assignments.
This video reports on such an assignment conducted in an English studies course. If you have an opportunity to visit the campus at UNC-Chapel Hill (or if you want to approximate the experience online), you can take the tour.