Probably a bit late to be posting this but sure it'll give ideas to someone at some stage.
A game I loved playing while learning to sail is "Pirates". Basically everyone sails around in a designated area (all normal rules of the road apply) and boats try to get a crew member onto another boat to capsize the other boat and get back on their own boat asap. This game really is great because as well as confirming rules like "starboard" and "windward boat", it teaches coming alongside, capsize recovery, what CAUSES a boat to capsize and if done in two person
dinghies, teaches people how to sail a 2 sail boat solo, always a useful skill.