Grand Canyon National Park Service - site includes maps; and information on camping and lodging, weather and climate, nature & science; hiking, rafting, and a variety of activities; an on-line trip planner feature is also available, nps.gov/grca

Arizona Grand Canyon National Park - info on what there is to see at the north rim and the south rim as well as detailed descriptions of the trails at each; photographs; info on other nearby sights like the Hualapai Indian Reservation and several other canyons, americansouthwest.net

Grand Canyon National Park Links - easy to access information on activities, tours, hiking, permits, fees, plants, wildlife, pets, and more, grand.canyon.national-park.com

American Park Network - another good site for information, activities, camping, flora & fauna, dining & lodging, and more

Grand Canyon Chamber of Commerce - FAQ section is helpful, photo gallery is beautiful, and adventures section leads you to lists of operators for such things as river raft trips, hiking tours, and visitors center IMAX shows

Utah Travel & Adventure - billed as "the quiet side" the North Rim of the Grand Canyon, while in Arizona, is accessible from Kanab, Utah; this site also provides information on nearby National Parks and various other things to do when visiting, utah.com

thecanyon.com - information on nearby towns, things to do, collection of beautiful photos of the Grand Canyon, a page of contacts for sightseeing by helicopter (4 different operators), and more, thecanyon.com

GrandCanyonHiker - a wealth of information for those adventurous enough to want to hike some or all of the Grand Canyon: books, gear, news photos, maps, and planning info

Grand Canyon Explorer - this site will help educate travelers, as it explores the geology of the canyon: how it was formed, where the rock came from, why it looks like it does, and when it all happened, complete with diagrams, kaibab.org

Secrets of the South Rim and Phantom Ranch - Josh Roberts writes this article for smarterTRAVEL.com to clear up any questions or concerns about a trip down into the canyon via one of two main trails, the lodging at the South Rim, and the only lodging available once in the canyon at the Phantom Ranch; see also the smarterTRAVEL "Grand Canyon Travel Guide" featuring articles, news & advice, and hotels