Would this be an appropriate activity for a water-loving, special needs (mild/moderate mental retardation) 13 year old? She follows directions, is a decent swimmer, but not the sharpest crayon in the box. She would love this activity, and it says "for all ages and abilities", but I wonder how the instructor would feel about this??? Any suggestions? Also, what age for a typical child would be the appropriate age to start the "scuba experience"? (non-cert shallow resort dives)