The Cypress Hills are said to be the highest point between the Rockies and Labrador. This is technically incorrect as the highest point of Labrador is also the highest point of Quebec, and Quebec being being West of Labrador, it stands to reason its highest point is by definition, closer to the Cypress Hills, at least by some tiny degree.
Certainly, they are quite high and the view from the South Rim allows one to not only see into the States but also pee into the Mississippi drainage basin should one feel the need. According to HBC early records, the native population referred to the hills as the "Dreaded Hills". The reason for this lies in the fact that the tribes in the area were mostly plains Indians who only went to the hills for resources from trees they couldn't get elsewhere. The treed environment was alien to them and they didn't like it much. For one thing, it was too easy for another tribe to ambush you. There seems to have been a lot of inter-tribal warfare in the area. I think I went by the site of one particularly nasty battle.
I estimate this took the best part of an hour and Leonardo still wasn't very clean by the end of it. However, he was clean enough to ride in the near ideal conditions offered by the Trans-Canada.