From Alpine on US 90, drive south on TX 118. Or from Marathon on US 90, drive south on US 385. Turn west on Basin Road and continue 7 miles to the South Rim trailhead.
February through April.
Naturalist’s Big Bend, by Roland H. Wauer, (Texas A&M University Press, 800-826-8911; $13.95). Big Bend: The Official National Park Handbook, (National Park Service, 915-477-2251; $7.95). Both are available from Big Bend Natural History Association,
Big Bend National Park, (915) 477-2251; www.nps.gov/bibe.