How to walk along canals in Venice without feeling like a tourist

I arrived in Venice believing it would reek of sewage. It didn’t. The walk into the centre went through cobbled alleys packed with loud Americans in sandals and Italian ladies tottering in kitten heels. But it was when crossing the Rialto bridge that I first felt as though I was truly in Venice, with tacky gold gondola models for sale at extortionate prices, and tourists jostling for prime photo spots.