Oregon, beautiful state on the Pacific Ocean, includes the high Cascade Range.
The Pacific Crest Trail offers 462 miles of hiking in Oregon. A bit lower is the 120 mile Metolius-Windigo Trail. An opportunity to explore the ocean is the 382 mile Oregon Coast Trail. The Fremont National Forest offers you the 134 mile Fremont National Recreation Trail.
Among the best, mainly mountainous, hiking areas are the Wallowa-Whitman National Forest, Willamette National Forest, Mount Hood National Forest, Umatilla National Forest, Umpqua National Forest, Deschutes National Forest. The list is longer, though.