Grand Canyon Field Institute. Instructors lead guided educational tours, hikes around the canyon, and weekend programs at the South Rim. With more than 200 classes a year, tour topics include everything from archaeology and backcountry medicine to photography and natural history. Contact GCFI for a schedule and price list. Private hikes can be arranged. Discounted classes are available for members; annual dues are $35. GCA Warehouse, 2-B Albright Ave., Grand Canyon Village, Arizona, 86023. 928/638–2841; 866/471–4435; www.grandcanyon.org/fieldinstitute. From $235.
Xanterra Motorcoach Tours. Narrated by knowledgeable guides, tours include the Hermits Rest Tour, which travels along the old wagon road built by the Santa Fe Railway; the Desert View Tour, which glimpses the Colorado River's rapids and stops at Lipan Point; Sunrise and Sunset Tours; and combination tours. Children 16 and younger are free when accompanied by a paying adult. 303/297–2757; 888/297–2757; www.grandcanyonlodges.com. From $22.