The Maritiem Museum (maritiemmuseum.nl; adult/child €17.50/12.50; closed Mon) overlooking Leuvehaven offers a touch of harbor history and strolling. Exhibits, from crane simulators to joystick-steered ships, entertain parental units, too. Moored out front, a functioning collection of historic vessels provides photo ops, and many can be boarded.
A watertaxi can take you right to the museum, but departing from here is a little less convenient as it's a popular embarkment stop. Phone ahead (010 403 0303) to book your ride or visit the museum as an early stop on a day of Centrum exploring.