I read all kinds of books (one of my friends jokes that I will read anything that holds still long enough), but sci fi/fantasy is my favorite. I also love books on anthropology and archaeology and other sciences.
A great view into the life and mind of one of our major visionaries. Without his skills, the United States would have failed miserably and fallen into the hands of the British, French, or Spanish. This is a book everyone should read, and more than just as excerpts, like I did in high school.