Hwy 101 mile marker 334.
The two parking lots above the Cape Sebastian corridor are about 200 feet high, and allow you to see a large portion of Southern Oregon beaches. According to the Oregon Parks link, you can see about 40 miles north, including Humbug Mountain, and about 50 miles South, all the way into California and the Point George lighthouse.

Site Resources: restroom

Entrance on 101

Looking North	Here's the view to the North, with Humbug Mountain in the distance.

This will be looking toward Crescent City and Point George, California	Looking South