Guided Hikes - North and South Rim. Day hikes and walks led by Park Rangers take place throughout the year. These programs are free and require no advanced sign-up. Another option would be to join a guided hiking and/or camping trip that is educational in nature, offered by the nonprofit Grand Canyon Conservancy Field Institute. They offer guided educational classes and tours at Grand Canyon National Park led by expert instructors. Topics include geology, ecology, history, archeology, photography,