The trip to Uithuizen can be combined with wadlopen – a guided walk across the coastal mud flats to the uninhabited sand-spit island of Rottumeroog, the most easterly of the Dutch Wadden islands. Excursion buses head out to the coast from Menkemaborg at weekends two or three times a month(June–Sept); the trip costs from €32.50 per person and lasts four hours: booking is essential – contact Stichting Uithuizer Wad (w wadlopen.nl). Without a guide, it’s too dangerous to venture onto the mud flats, but it is easy enough to walk along the enclosing dyke that runs behind the shoreline for the whole length of the province. There’s precious little to see, but when the weather’s clear, the browns, blues and greens of the surrounding land and sea are unusually beautiful. From Uithuizen, it’s a good hour’s stroll north to the nearest point on the dyke, and you’ll need a large-scale map for directions.