Discworld books by Terry Pratchett. The best description I've ever heard is they are JRR Tolkien mets Mel Brooks. There are 41 books with multiple story lines but every book is written to be stand alone. Most are around 300 pages with plenty of good stopping points, making them easy to pick up and put down.
I read them in publication order, but there are multiple guides on recommended reading orders if you want to read specific story lines.