Pretty much anything along the lines you are asking about falls into the domain of the legendary "Transportation Desk." Here are their "vitals."
CONCESSIONER TRANSPORTATION DESKS
Information about Phantom Ranch facilities, mule trips, horseback riding, air tours, one-day float trips, and motorcoach tours (including wheelchair-accessible vehicles) is available at the lodge lobbies (hours vary seasonally). Call (928) 638-2631, ext. 6015.