Fodor's Expert Review Four-Mile Trail

If you decide to hike up Four-Mile Trail and back down again, allow about six hours for the challenging, 9½-mile round-trip. (The original 4-mile-long trail, Yosemite's first, has been lengthened to make it less steep.) The trailhead is on Southside Drive near Sentinel Beach, and the elevation change is 3,220 feet. For a considerably less strenuous experience, you can take a morning tour bus up to Glacier Point and enjoy a one-way downhill hike. Difficult.