Here are two I know fairly well. I’ve read Fantasy most, but I’ve dabbled in some Sci Fi – Michael Crichton’s The Hot Zone, Douglas Adams’ The Hitchhiker’s Guide to the Galaxy. Those count, right?
Science Fiction: Well, according to AQ, yes, they do because Crichton’s work and Hitchhiker’s “incorporate various types of science into its story, setting, characters and the challenges that they must overcome”. Okay, now you may think, “Hitchhiker’s is a bit of a stretch”, but AQ says that “scientific details, facts, and rules are either adhered to or broken, but either way they contribute to the contextual story line as well as the world created within the novel”. Hitchhiker’s takes place in space. Science!
Fantasy: I suppose you could say that’s really more to my liking. Aside from the description I’m sure you already know – imaginary worlds, mystical creatures, princes/princesses, knights, dragons, wizards, etc. – AQ also mentions that the “only limitations are the expectations and preconceived notions of its dedicated readership”. As one who is very close to this “dedicated readership”, the best way to get an idea of these “limitations” is to read the work already out there. I might recommend Katharine Kerr’s Deverry series or Piers Anthony’s Xanth series; for those who have already exhausted the works of Tolkien. Keep in mind that each author creates their own world, often including history, religions, and languages, so it’s always best to begin at the beginning.