I'll qualify all of these recommendations with this; My recreational reading is for pure escapism. Between school work and work work I spend a lot of time reading very dry stuff. When I pick up a book by choice I want something that's going to suck me in. I don't care if it's going to make me a better person, just that it's going to amuse me for the time I'm reading it.

If you're more into mysteries you might give author Dick Francis a try. He was a professional jockey in England before turning to writing so most of his mysteries are centered in that world. They're considerably less "hard boiled" than someone like Lee Child but they're fast, enjoyable reads and there are a ton of them.

I know you said you're not into Sci-Fi but I really recommend you try Starship Troopers if you like military fiction (Please don't mistake it for that abortion of a movie).

Steven Pressfield (historical fiction); Gates of Fire and The Afghan Campaign are both really good. Killing Rommel also. Tides of War was dry as hell and very convoluted. Virtues of War and Last of the Amazons weren't bad but not great. The Profession was pretty good but set slightly in the future (about a generation) so that might not be your thing. The Legend Of Bagger Vance is really good (and I don't give a shit about golf) but is a little more philosophy (think-Zen and the Art of Motorcycle Maintenance).

C.J. Box has a pretty good series of mysteries about a game warden in WY.

Leadership and Training for the Fight by MSG Paul Howe is an excellent read for anyone in a leadership position.

Jack Higgins and Alistair Maclean both wrote some pretty decent trash literature in the adventure/thriller genre.

Mario Puzo's books are decent (he's the guy who wrote The Godfather) in the Mobster/crime genre.

Bernard Cornwell and Conn Iggulden both have a couple of good series in the Historical fiction genre.

Ken Follet wrote several good books (Pillars of the Earth is fantastic) also mostly Historical fiction.

That's it off the top of my head. Hope some of those can keep you busy.