Some hikers claim the Pacific Crest Trail to be the most scenic long-distance hiking trail in the world.
"Zigzagging its way from Mexico to Canada through California, Oregon and Washington, the PCT boasts the greatest elevation changes of any of America's National Scenic Trails, allowing it to pass through six out of seven of North America's ecozones including high and low desert, old-growth forest and arctic-alpine country. Indeed, the PCT is a trail of diversity and extremes. From scorching desert valleys in Southern California to rain forests in the Pacific Northwest, the PCT offers hikers and equestrians a unique, varied experience."
That description, from the PCT website above, is true; it's a grand and beautiful hike. But it will take planning and a bit of luck to thru-hike it successfully. For planning and actually doing the hike, I recommend five paperback books. The first book, Pacific Crest Trail Data Book, by Wilderness Press, is indispensable. It lists landmarks, mileage, elevations, facilities from south to north for the entire 2,663 miles. The second is Yogi's PCT Handbook, by Jackie McDonnell. It provides detailed information from an experienced thru-hiker, and it will help you prepare your thru-hike—required permits, resupply points, packing, gear, weather, etc.
Three other books, all from Wilderness Press, are Pacific Crest Trail: from the Mexican Border to Tuolumne Meadows, Pacific Crest Trail: from Tuolumne Meadows to the Oregon Border, Pacific Crest Trail: Oregon and Washington: from the California Border to the Canadian Border. To reduce pack weight, I copied only the pages I needed to reach the next supply point. This may seem like a lot of books, but you can browse these books as you plan your hike and focus on important sections later. Familiarize yourself with the PCT website, keep checking snow conditions, and you'll do fine.