I'm on a middling size lake and when taking out non-sailors I always give a safety brief that includes the basics; man overboard, including what to do if it happens to me that leaves the boat in an unplanned event while underway, life jackets, boom, basic engine operation and how to use the radio and emergency numbers as well as marina phone numbers.
After a little incident last June I'm working on updating what I do.
I had my son and daughter in law and two of my grand kids out for a sail one beautiful Monday morning and we decided to anchor and go for a swim. I was done swimming and had climbed back aboard was was in the process of getting dried off and starting to put things away. Stepping down into the cabin I managed to slip on the top step and made an express trip to the cabin sole. My thoughts while I was doing my initial self assessment of how hurt I was went to "What the hell are these kids gonna do if I just seriously borked myself?". I now have a laminated card with several emergency numbers that I keep in a drawer and show and tell guests where it is and who to call.
Luckily I was able to go about getting the anchor up and get us back to the dock without letting them know how much pain I was in.