Oh, its big all right. Damn big!
The water may be colder than in tropical destinations, but it is definitely worth going snorkeling in Canada. You are likely to observe and interact with lots of fascinating marine life, such as harbour seals, as you look around Canada's waters. There are so many different varieties of bright and beautiful starfish for you to see, and the anemones clinging to the rocks and forests will entrance you. Crab and other crustaceans are sure to be found as well. You also have the opportunity to snorkel with seals in Canada, with the harbour seal probably the most wide-ranging pinniped.