You will get wet when whitewater rafting and, even in the summer months, the water's cold. Yet, since most people raft in the summer's warmer months, you'll also get hot and, quite likely, sunburned. So, plan ahead as much as possible. Rapid-dry fabrics are best, with sunscreens almost mandatory. Hats, on the other hand, will likely be replaced by helmets offered by the rafting companies . . .
Shoes are always a big question mark for whitewater adventures.
Soft-soled canvas shoes are often best, firstly because they can grip on questionable surfaces and secondly because they, like the people wearing them, will get wet. Cameras are always popular whitewater rafting and canoeing take-alongs but they, too, can get wet . . .