The North Boat Harbor is the best one for wandering the docks, talking to crews and possibly scoring some fresh fish. Begin at the Harbormaster Office; a wooden deck provides a picturesque overview of the commercial fleet and has a series of interpretive panels that will teach you the difference between purse seine and a long-liner.
Continue north to Petersburg Fisheries, the original outfit founded by Peter Buschmann in 1900; today it’s a subsidiary of Seattle’s Icicle Seafoods.