Riding in Escarpment country

Wow, it has been a long time since I started a thread on BT!

I have a 130 km ride coming up this weekend (training for IMWI) and wanted to get in some good sized hills.  I live in woodstock - we have a couple of good hills, but they are far apart so not really a hilly ride.  Anywho, was planning on heading to somewhere on the escarpment and practicing riding hills.  Anyone have a good route or a suggestion on roads I could ride on?  Would be about equal distance for me to drive to both hamilton and milton, but would be willing to go a little further if someone has a fab idea.