If your trip to Kloosterburen is all organized but your itinerary is a bit on the empty side, we can give you a helping hand.Plan a stop at Pieterburen Seal Sanctuary. It's one attraction you'll find on most visitors' must-do lists. If you still have some space on that itinerary, Arboretum Notoarestoen and Galerie Jacoba Wijk will keep you on the go too.