Walking all the way through the canal-side market to the end you will come to point where two boats are tied together, bridging the Khlong.
For 1 Baht you can cross over to the Big C supermarket. This is truely where the old world meets the new.
If you are on a Bangkok layover then certainly take the time to visit Wat Bang Phli Yai Nai; you are sure to enjoy the trip.