The boat tour is located at the Marina da Ria Aveiro. They have two type of tour. I would recommend the 50 minutes tour just the main canal tour. Unless you have more time, you can take the longer tour.
The tour take you under the bridge of Ponte Lacos de Amizade - love bridge. This bridge when two love each other tie the ribbon on the bridge rail. Any how you are in the gondola of Portugal like Venice in Aveiro. I like the main canal tour because it take you to the important point of the city. You can see a building shape like cruise ship, the famous Rua Doutor Bernardino Machado with color building.
The guide will explain the tour along the way. read more