Regina has an IMAX theater. That's one thing I've done to kill time there before. Wascana lake and the legislative building are a nice area. The royal Saskatchewan museum has dinosaur fossils, and maybe the biggest T-rex in the world.
Have you been to Grasslands before? I recommend you bring binoculars. There're few obstructions to your view, so when wildlife is present, even if you spook it, you can watch it for/from a great distance. Bison roam the west block. You may get pretty close to them. I may be able to answer other questions you have.
Well east of the east block is a region called the Big Muddy Badlands. The Sundance kid and the wild bunch gang used that area to hide in caves and gullies from lawmen. Not sure if Butch Cassidy himself was there; I should read up. There isn't a well defined "destination" as it's not park land and all privately owned, but a natural place to stop, off the beaten path, is Castle Butte.
https://greatsouthwest.ca/big-muddy/pla ... big-muddy/Here's a route you might take if you want to avoid Hwy 1.
https://en.m.wikipedia.org/wiki/Ghost_T ... skatchewan)