If you go
Xanterra Parks & Resorts: Xanterra operates all accommodations within Grand Canyon National Park except campgrounds. Campground bookings can be made directly through the National Park Service (nps.gov/grca). Starting at about $100. 1-928-638-263; xanterra.com.
Arizona Raft Adventures: One of 15 private companies that contract with the National Park Service to provide Colorado River trips. Each offers a variety of trips lasting up to 18 days, from $250 a day. 1-800-786-7238; azraft.com. The Park Service's list of concessionaires is at nps.gov/grca/planyourvisit/ river-concessioners.htm.