There is an old World War II bunker you can explore up here. Don't forget your flashlight.
Also, Clark of Lewis & Clark fame wrote the following in his journal from the top of McKenzie Head.
To the iner extremity of Cape Disapointment passing a nitch in which there is a Small rock island, a Small Stream falls into this nitch from a pond which is imediately on the Sea coast passing through a low isthmus. this Cape is an ellivated circlier [cir-] cular] point covered with thick timber on the iner Side and open grassey exposure next to the Sea and rises with a Steep assent to hight of about 150 or 160 feet above the leavel of the water this cape as also the Shore both on the Bay & Sea coast is a dark brown rock. I crossed the neck of Land low and ½ of a mile wide to the main Ocian, at the foot of a high open hill projecting into the ocian, and about one mile in Si[r]cumfrance. I assended this hill which is covered with high corse grass. descended to the N. of it and camped. [walked] 19 Miles [to-day]." (DeVoto 1997, 287)
Clark and his party of men returned to the base camp on November 20th. A few days later, the Corps of Discovery decided to investigate the south side of the Columbia River, and eventually established Fort Clatsop there as their winter encampment.