hey!
Les Escoumins is very nice, but also on the wrong shore if you are heading to Gaspe, unless you want to take the ferry back to the south shore. for diving info of Gaspe I'd contact "Plongee Capitale" in Quebec City, they organize dive trips there every year. for diving along the way it really depends where you are coming from. I usually dive on the north shore of the St Lawrence, I am not familiar with any shore diving on the south shore. on the south shore depending on your experience level a charter dive for The Empress Of Ireland would be a great addition to a dive trip. If you are coming from Ontario ( 401 ) there is lots of diving along the way.. until you hit Montreal.