If you flip, tump, dump, or go overboard, save yourself first. If thrown from your boat, remember it is safest to float on your back with your feet upright pointed downstream. Don't fight the current. When you reach a calmer spot, swim to the side. Drink lots of non-alcoholic fluids.
Water is best.
Carry more than you think you'll need. Avoid getting your boat broadside to a tree or rock. Use your hands to help guide yourself through trees and under limbs. Avoid getting your paddle caught in limbs. If you are in the water, avoid being on the downstream side of your boat.