Best route north of Toronto? (Peterborogh to Guelph)

[LeGobu]

I'm thinking of riding from Ottawa down to southern Ontario and do some touring closer to home. I'll be visiting friends in Guelph and Owen Sound, then on to parts of the province I've never been to along the Huron and Erie shores. I really have no desire to cycle across Toronto's sprawl, so if anyone has some advice on the best routes north of the city from Peterborogh to Guelph, I'd really appreciate it.

Thanks in advance!