It wouldn’t be a taiko camp if the kids didn’t play taiko! I recommend teaching a song that combines unison playing with soloing so students get to experience both of these elements of our art form.
In my most recent camp, I taught Matsuri, arranged to include short duets the kids wrote themselves. I broke the process down over the 5 days of camp as outlined here. By the last day the kids were ready to perform the song for their mini-obon.
Happy teaching camping!