We dumped our luggage at lockers in the train station (5,45 for 24 hours, after you figure out the process).
We wandered for several hours, interspersed with breaks for snacks and drinking. We climbed the 218 very narrow, dim, twisty steps to the tower lookout of Sent-Janskerk. Nice view.
Shopping was achieved, and goodies purchased for the train to Paris, later this afternoon. Time to chill for a bit.