If there is a Canal in a city, there will be a canal boat tour. In Nordic, canal tour could be long and short. Most famous canal tour for regular tourists could be the Copenhagen canal tour start from Nyhavn and Stockholm Canal tour starts from the Stockholm City Hall bridge.
Copenhagen from London Dee
If you have more time to explore the water side of beauty, there are more possibilities. For example, the Hans Christian Andersen Canal tour in Odense, and Gota Canal tour cross Sweden.