Keeping it simple worked well at the rental spots in France. I sailed a Hobie 14, Hobie 16, and Prindle 16 as rentals in difference places on the Atlantic coast and english channel. Their strategy was to keep sailors close to shore and make sure no one sailed alone when it was windy unless they knew what they were doing. Also, they encouraged crews of 2-4 on the cats, and went over basics of weight distribution. Other than that, it was largely "figure it out yourself." Then, of course, there was an emergency zodiac in case of trouble.