Even allowing for the usual air of frivolity commonly associated with such watery zones, strolling along the Waalkade, Nijmegen's waterfront, is enjoyable, especially if you're into boats and shipping. This stretch of river, Europe's busiest, sees a large barge or ferry plying the waters past Nijmegen every few minutes. Walk or ride a bike along the Waalbrug for breath-stealing sunset views of the old town, with the water and boats below.