"Zen and the Art of Motorcycle Maintenance." I will never stop spamming the magnificence of this book.
Great Expectations is an awesome tale. Perhaps A Christmas Carol by Charles Dickens if you're interested. I just finished reading Fahrenheit 451 by Ray Bradbury. It's amazing. I just started All Quiet on the Western Front by Erich Maria Remarque. It's also pretty beast
Normally, I'd suggest Discworld by Terry Pratchett, but books as wonderful as that are best saved to be used as escapes from the boring world of school/work. Over a break, I like to read bigger, more serious books- currently, I'm finishing up the Ender series by Orson Scott Card (There are two seperate 'cycles', making for eight books in all - I'm on the eighth); I'm also starting the Night Watch trilogy by Sergei *mumblemumblemumble*, a Russian author. They're both adult-ish books concerning fantasy/sci-fi wars set in otherwise realistic worlds.