For Canada, looking at the current map:
It may be worthwhile to look at what has already been proposed on the spreadsheet. Montreal has two proposals so far — Fur Trading Centers of the Northwest (seconded) and Habitat 67. Toronto doesn't have any, but FredericM has suggested the CN Tower be considered, so you might have a second if you want to propose it.
Fur Trading Centers of the Northwest also includes York Factory, which is in Manitoba and pretty much on the Hudson Bay. Winterkjm's Lake Superior proposal (seconded) covers Ontario and the Great Lakes. Sirmilik National Park (seconded) is in Nunavut, and covers polar bears and the Northwest Passage. Qajartalik
, a petroglyph site on Canada's TWHS list is also in Nunavut.
Saskatchewan is a bit empty, true. They have Grasslands National Park
and their West Point/FBI academy for one of the symbols of Canada, the Royal Canadian Mounted Police
, in Regina (aka Pile of Bones). I've visited the depot, and they do have a couple buildings from the late 19th/early 20th century amidst some newer, less photogenic brick buildings. Also in Saskatchewan near Saskatoon is Wanuskewin Heritage Park
, which is currently on Canada's TWHS list, hoping to become the first WHS in the province.
In Nova Scotia, the counterpart to Acadia would probably have to be Cape Breton Island, which has a beautiful park, Cape Breton Highlands
. I'm not sure how it would fare against the scenic Gros Morne National Park, a WHS to the north in Newfoundland.
Bay of Fundy is of interest. I may throw together a proposal for that one, focused on the New Brunswick side.
For maple syrup and sugaring houses, I'd recommend you see if there is anything historic in Quebec. Mennonites also exist in many places in the US, but the Amish in Pennsylvania generally draw more interest and visitors for their culture. Perhaps FredericM has insight as to whether Mennonite culture is important in Canada.