If you don’t already, a good thing to own is a road atlas of your country.
I also have been wanting an astronomical almanac that would have info like sunrise/sunset times (got that idea from I Am Legend), and various other sky stuff data I don’t know how to use for timekeeping and navigation but would like to learn :] My lack of expertise (ok, maybe also motivation) has prevented me from finding one.
There used to be agricultural almanacs also, with recommended planting dates. I looked into the extant USA ones (Old Farmer’s and Farmer’s) but they seem to have devolved into something more like annual rustic-themed magazines with barely any useful info… :[