Thanks so much for the replies! Especially the sock info and about not getting waterproof shoes. Also for the thought about the shoes not lasting through school. I think I've actually decided to get them each a pair of amphibious sandals with a toe, which will probably work for 80% of what we are doing on this trip. Then also buy them each a pair of good athletic shoes on sale to use when sandals won't work and to keep for everyday/school use after he trip. And some wool or synthetic socks. You guys have been very helpful!