I have been teaching children in dinghies for 16 years and am always on the look out for games to play. One that is successful with children at least is 'chicken'. You perhaps could adapt it for older students. Basically it is a version of 'stuck in the mud'. You designate an area - 4 buoys- and all your victims sail around. You have a paddle and have to hit their sail on the leeward side. If you are successful they have to heave to and sing 'I'm a pretty little chicken' - your variant here! They have to stay in this position until someone else comes and releases them by touching their boat. It is great once they know the basics since it involves lots of tacking and gybing. They soon learn to gybe onto the opposite tack to avoid you. I do this from a Kayak but you could use another dinghy or teaching boat. Hope this helps and if anyone else knows of something else please let me know. Where are all the websites for this neglected area?