Imagine a trail, linking the Willamette Valley and the Pacific Ocean. Envision traveling at the pace of the Native Americans, early settlers and naturalist explorers for an afternoon, a day, a weekend or a week, through the Oregon Coast Range, rich with history, geology, rural life and a haven for wildflowers, lush forests and wildlife.
http://www.c2ctrail.org/

The Blue Mountains Heritage Trail (BMHT) is being designed as a long-distance trail, primarily for foot and pack travel, through the best of Northeastern Oregon’s Blue Mountain primitive region.
http://www.bluemountainheritagetrail.com/

From desert to glacier-flanked mountain, meadow to forest, the Pacific Crest Trail (PCT) symbolizes everything there is to love - and protect - in the Western United States. Join us as we celebrate, enjoy and safeguard this unique American treasure.
http://www.pcta.org/

400 mile hike in Northwest California's Klamath Mountains
http://conifercountry.com/Bigfoot_Trail/index.html

Twisting and turning for twelve-hundred miles, the Centennial Trail spans the length of Idaho. Those who follow its circuitous path travel through some of the state’s most incredible scenery...
http://www.idahoptv.org/outdoors/shows/centennialtrail/coordinator.cfm

The 1200 mile Pacific Northwest National Scenic Trail (PNNST), running from the Continental Divide to the Pacific Ocean, ranks among the most scenic trails in the world.
http://www.pnt.org/