Situated on the edge of an extensive coastal lagoon system, Aveiro (uh-vey-roo) is a prosperous town with a good-looking centre and a youthful, energetic buzz. It's occasionally dubbed the Venice of Portugal thanks to its small network of picturesque canals. But where the Italian city has gondolas, Aveiro has moliceiros – colourful boats traditionally used for seaweed-harvesting but now used for canal cruises.