Craborn,
What we do and this works very well, is we put 20 kids in the pool at a time, they must be 12+. We teach all 20 snorkeling skills, fin kicks, clearing their snorkels, then we teach them surface dives and ear clearing. After this we split the group into 2 and 10 girls and 3 instructors go and work with the girls on SCUBA in the shallow end, they teach them about the equipment, how to clear their regulators and then they let them swim around for about 20 minutes shallow end only. The other girls play in the shallow deep end with the masks fins and snorkels, then they switch. The girls love it and have a fabulous time. Only our better swimmers are allowed to participate. Have fun this summer. Working at camp is a lot of fun!