Three Days or More: With all due respect for a rim-to-rim hike, the Hermit Trail, a 15.4-mile (25-kilometer) round-trip below the South Rim, delivers much of the same impact and none of the mule trains. Start at Hermits Rest off Hermit Road and descend into the red-rock abyss -- a 3,800-foot (1,158-meter) plunge that was carved out for hikers by Santa Fe Railroad workers.
Camp at Hermit Creek and take day hikes on nearby portions of the scenic Tonto Trail and down to the Colorado River. Note: There's untreated water at Hermit Creek, but none along the way; carry plenty for the commutes.
Must-Do Secret: As far as desert road trips go, the 61-mile (98-kilometer) Sunshine Route, south from State Route 389, must be in the top 10. The rough but generally 2WD-able route delves into a remote western section of the park known as the Arizona Strip and ends at Toroweap Overlook, a 3,000-foot (914-meter) bright ocher free fall straight down to the Colorado. When you arrive, you just may have the view, and one of 11 nearby primitive (no water) campsites, to yourself.
Vitals: On the South Rim, Bright Angel Lodge has rooms ($50; www.xanterra.com ) and detached cabins ($109). On the North Rim, GrandCanyon Lodge has upscale rooms ($96; www.grandcanyonnorthrim.com ) and good food. For park info, camp reservations, and backcountry permits ($10, plus $5 a night per person), visit www.nps.gov/grca.
For more top adventures in the national parks from National Geographic Adventure, click here.