Head to the Gowanus Dredgers Club at 165 Second Street near Bond (at the canal) for a quick paddle lesson and life jacket fitting, then hop in a canoe and explore the canal on this free, self-guided tour. Canoes are available every Saturday from 1 p.m. to 5 p.m. through October. Check the Gowanus Dredgers Club website for last-minute scheduling changes.