I remember doing car rallies when I was a kid with YMCA. You'd pile the families into their cars and give them a set of navigation points with cryptic questions to answer and various 'evidence' that needed to be collected around the course.
It would often end up in hilarity, people getting lost, cars breaking down, the differing 'evidence' and answers that were presented, it was the most popular event of the year.
I've often wondered how you could do that in a 'yacht race', I reckon it would be great fun