I don't read a lot of fiction. The last few years I've been into biographies. I love history but don't always want to read a straight up history book (although I often do, I'm reading a book about how the Renaissance evolved out of the Dark Ages right now. Boy, the Popes sure liked their orgies back then). Biographies give a really good account of the time the people lived in but are usually lighter reading than a history book. Only problem is you always know how they will end.
Lately I've read biographies or autobiographies about Jimi Hendrix, William S. Borroughs, Neil Young, Ghengis Khan, Woody Guthrie, John Lennon, Hunter S. Thomson, Marco Polo, John Adams, Keith Richards, Jack Kerouac, Jacob Riis and a few others. They always give me unexpected insights into another time and place but are fun reads usually. Also, if you have never read Angela's Ashes its amazing how something so sad can be told with such good humour.
My favorite reading strictly for entertainment is anything by P.G. Wodehouse, but especially the Jeeves and Bertie Wooster stories.