There are a lot of variables - day of the week, season, events going on. In the middle of winter on a Tuesday there might be only 10! In the summer on the weekend there could be hundreds. On an event weekend - the Grand Prix or Thunderboat Races there will be thousands. Then there are those who only go onto the island to go to the Detroit Yatch Club or to the rowing club. I know this doesn't answer your question - but I don't think anyone knows the average as there is no fee to go onto the island.
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