Licensed river outfitters in area towns provide one- to nine-day float trips through the remote canyons of the Rio Grande. Advanced reservations required for lengthy trips. For information, call Big Bend River Tours at 432/424-3219 or 800/545-4240; Far Flung Adventures, at 432/371-2489 or 800/359-4138 (visit www.farflung.com); Rio Grande Adventures at 432/371-2567 or 800/343-1640; Texas River Expeditions, 432/371-2633 or 800/839-7238 (visit www.texasriver.com); and Scott Shuttle Service Canoe & Float Rental at 800/613-5041.