Chuck posted photos here of his recent, exciting trip down the Colorado River in a five-person raft with no motor. His trip took 16 days.
I did the same trip in 1988 though in a very different situation that was dramatically easier. Our raft had a metal skeleton. There was a motor and two spare motors, making it possible to make the run in 8 days. More important, the motor made it easier for our guide to navigate the more difficult falls. The raft was made to carry 21 guests plus the guide and his assistant but the company we used never booked more than 14 guests per raft, allowing for plenty of room. The guests were aged from 8 to 60. Naturally, the eight-year-old held up the best.
I don't remember ever having to hold on for dear life; indeed, encountering 6-foot (2-meter) waves in the most turbulent area of the raft where I always sat was less turbulent than going down a local river in West Virginia in an 8-person raft.
As for amenities, we were provided tents, though none were ever used. A basket containing cans of beer was always in tow behind the raft, allowing the cold river to keep the beer cold. 300 pounds (135 kilograms) of ice kept the raw food fresh. Full breakfasts included cooked eggs and a variety of cereals. Lunches were made of sandwiches. Cooked dinners of seafood, steak, or poultry always included dessert, sometimes a baked dessert.
Going down the Colorado River in this raft was probably more like crossing the Atlantic Ocean on the QE2. My hat is tipped to Chuck for making the trip the way he did it.