Oh, there is always Canal Road, but be careful as it's never in the best of shape.
Also in Holland Landing there are a couple of twisties off of highway 11 on your way to Newmarket.
And look for Castlederg? Sideroad out to Airport road. It's a bit south of you, and I enjoyed hitting it from Lloyd town road on the west side.
Mullock road of of bayview but watch out for poor surface. Head on over that way, drop south a bit and then West again through a sleepy little town that used to have a great Italian bakery. It's a one horse town so don't blink.
There has to more I'm forgetting. Lol.
In Bradford I cross from Huronia on a sideline that takes you to the cement factory, (industrial Parkway?) that hooks up with Dissette southbound. Avoiding yonge St most of the way.
Also try the North end of Holland Landing on East side of the 400 heading south into the Marsh and onto canal road. It's interesting in spots and very rural.