"The Call of the Wild" and "White Fang" by Jack London
"Hatchet", "The River", and "Dogsong" by Gary Paulsen.
I know these are children's books but I would definitely recommend giving them to your kids and a quick read through if you haven't read them yourself. I hated going camping with my parents until I was 11-12 and read these and then started seeing why the wild outdoors is the greatest place you can be.
"Mountaineering; The Freedom of the Hills"
"SAS Survival Handbook"
