Originally Posted by
tolkien
Sandals would be good for water, but they would flop around (friction = blisters), fall apart quicker than boots, retain heat poorly, and perhaps most importantly I think they would allow the terrain to wear more on your feet, due to the lack of arches and ankle support and the open toes. Also, I have a phobia of snake bites (not snakes, just poisonous bites) and I cant help picturing a rattlesnake biting into a big toe.
That last bit may be a bit sensationalistic, but you get the idea.
I would hike mostly with boots, but bringing sandals along for easy stretches and to shower in might help preventing food odor and fungal infections.