History, Nature, and Serenity Unite at Cape Henlopen
I visited Cape Henlopen State Park in the off-season (January, 2005) when admission was FREE (can't beat that price!). We climbed to the top of the fire control tower and strolled amidst the old ammo bunkers and naval artillery forts... the place had the same kind of feel as Alcatraz, but without the crowds and the expensive ferry ride!
There is ample beach and the facilities are brand new... just about the only thing I didn't like was the map... it was not to scale, and consequently when my wife and I took a "short" cut, we ended up hiking for almost an hour! That said, it is definitely one of the most beautiful and interesting spots in Deleware for those of us who like history and natural beauty.