I'm finding this somewhat difficult to answer!
During most of 2012 there was just one boater on my boat most days of the year, but there was no-one on her over several weekends. A fair amount of the time there were 4 'boaters' on her - if we count the grandkids as 'boaters'! Once or twice during the year there were 6 or more, and at New Year there were as many as a dozen!
So, do I count each day on the boat by each 'boater' as one 'visit'? Only it's beginning to look as though it would take a long and somewhat complicated sum, and I'm not very good at sums!