Cape Henlopen lies at the southern point of the mouth of the Delaware Bay. The park is adjacent to Lewes, Sussex County, State of Delaware.
The park has a popular, 24 hour and year round fishing pier (on the bay) as well as a campsite (not directly on water). The remainder of the park is only open from sunrise to sunset, and includes a bathhouse on the Atlantic Ocean, an area for surf-fishing, a disc golf course, and bicycle and walking paths.
Entrance is free during off-season (winter), but runs $5-$10 during the on-season (summer).
Within the park grounds are a handful of stone towers from World War II era, as well as underground ammo bunkers dug to be used with the towers against the eventuality of air attack.
Off the coast on the bay side are two lighthouses, called breakwater lights.