Although Domburg is a low-key seaside town, it's still jammed-packed in summer due to its lovely beach. To escape the crowds, head south along the tall dunes. You can keep going past the golf course for a good 4km.
The tourist office can steer you to one of many bike-rental shops and provides maps of the popular 35km Mantelingen bicycle route, which begins and ends at Domburg. It takes in beaches, countryside and atmospheric villages such as Veere.