The De Winton area has some nice quieter roads. This route only has a couple kms on a highway and the rest are paved country roads. I'll sometimes park in the Heritage Pointe Shopping Centre and make my way over West. You have to cross Macleod at the lights.
https://www.strava.com/routes/2719568560219016132
If you park at the shopping centre and go East on Dunbow, there's more highway but big shoulders for most of it. Here's another route.
https://www.strava.com/routes/2719570418080373700
Neither are full 50km but you could explore a bit more out there. Lots of dead ends but still fun to see the farms and homes along them.