Us vs great big alien worms. I've got the GURPS setting book for it, but I'd never found the original books locally. I should put that on my list the next time I go through the used book stores over Matt26's way.

You should check out the Fuzzy books- Piper's stuff was pretty adult for the day, but now it's fairly tame. They put out a combined edition about ten years ago, you can find them used for under ten bucks and it should be adaptable into a bed time book when DD1 is a few years older. And the third in the trilogy is great from a survival perspective- EDC, hardcore survival situation, primative bushcraft, signalling, et al.