Except for the "This is not your home toilet," instructions, the hardest thing for people to internalize ahead of time seems to be the flexible nature of schedules; that on a sailboat the schedule is absolutely determined by wind and weather and "No we will not be sailing in that tropical storm so you can get to your appointment". People are so stinking scheduled these days with minutes all planned out on their handy pocket computers, they have a really hard time dealing with any uncertainty. You get almost a blank stare when they are confronted with the reality of not being able to plan down to a fifteen minute window. Does this say something about our culture? (by the way, that's a rhetorical question.