Oops, forgot that you asked about Saskatchewan and Manitoba.
Well, Saskatchewan in particular has a different kind of charm that many people might describe more as a lack of charm. For me, I'm quite a history nut these days, and although I find farmland boring, Saskatchewan has many areas where the original untouched prairie still exists as it was when my great grandparents migrated to this country. I find original untouched prairie to be beautiful and I enjoy looking at it and wondering about what it has seen in the past. There are places where you can still see the scars left in the land by the original wagon trails of the first settlers and trading traffic, and many places where circles left in the ground tell of a long ago Indian camp and the location of it's teepees.
One area of particular fascination to me is the Cypress Hills on the borders of Saskatchewan, Alberta and the U.S.A.. It has so many interesting features. The land is high enough that it was largely unaffected by the last ice age, so there are many species of plant and animal life there that exist nowhere else here now, things you wouldn't expect to see. And fascinating history, from whiskey and trading forts to the N.W.M.P. (now the R.C.M.P.) fort, Fort Walsh, where Sitting Bull and his followers settled after their run-in with Custer, and the friendship that developed between Sitting Bull and Colonel Walsh - whose advice was largely instrumental in Sitting Bulls decision to return to America. There are still fort remains to be seen, and Fort Walsh has been rebuilt, the teepee circles of Sitting Bull and his people are still visible on the hills around the fort.
But otherwise Saskatchewan is largely just lots of stretching flat land and sky, with not much in the way of trees and water until you get in to the northern parts of the province. Manitoba I know not much about, having only quickly driven through it a few times. Again lots of prairie land, but also a much wider degree of forest and lake land.
Have a good night