Thanks everyone for your interest and efforts. Well done to the 3 guys who registered a 'full bank of green'.
However... The win goes to Richiefish, for his acute observation of the telltale sign of boardshorts over wetsuit. (no photoshop needed this time eh Richie!)
"To avoid any trouble the resort got a kitesurfer (note boardshorts over wetsuit) to instruct this particular student."