well, these are all pretty obvious and you may have read them, but just in case you haven't.

i loved "The Martian Chronicles" by Ray Bradbury.

if you're looking for something that you can pick up and put down and not get too heavily invested in, i would recommend "Isaac Asimov: The Complete Stories". it's a compilation of his short stories and is quite fun to read.

"Treason" by Orson Scott Card...has some fantasy elements to it as well.