I crave books, lots of different kinds. Every flat surface of my house has piles of books.
What I really live for is a well-written mystery. I love learning about a particular time or place via the vehicle of a good mystery; history and geography are great foils for a detective story. I'm a bit picky, too: I want the author to write well, do good research, and introduce me to a world I hadn't yet discovered.
You'll also find in my list of good reads a wide variety that includes books on photography, gardening, cooking, nutrition, history, travel .... You get the idea.