Digital Scavenger Hunts

I liked doing the scavenger hunt, but I have some concerns.  As I have stated earlier, I will be working with special education elementary students.  I would love to use this with my class, but I feel the scavenger hunt would be limited to the classroom.  I feel this way because I am only one person and cannot watch about 30 young students running in different directions.  So I would have to limit the locations of picture taking to the classroom.  Also I would need a lot of cameras and every school I had been to did not have a lot of cameras for classroom use.   Students who have learned content can then find examples relating to that content.  If I have the resources, I would love to use this kind of activity in my classroom.