I know that St. Croix Island--Dochet's Island--is jointly viewed by both the U.S. and the Canadian side, and certainly the intention is that it not be visited, as there are other ways for the story to be told. During the celebration in 2004, there were boat tours and certain interpretations. There is a national historic site, a location where you can view the island and hear the stories, those sorts of things. So the intention is certainly never to have that island overrun in order to have that story told.
On the Nova Scotia side, around Grand-Pré and Port-Royal, protections are equally in place.