Some of my favorite science fiction which are all very well known are:
The Hitchhiker's Guide to the Galaxy
I Am Legend
You might also enjoy The Hunger Games. It's a young adult novel (I'm not even aware of your age but I thought it worth stating), but it's an easy read, and very good. If you are not much of a reader it might do you well to read the Harry Potter series. Once again a young adult series, but very good, and they read quick and easy.
Here is a list of free books I have read on my Kindle and that I enjoyed. Free from Amazon. (Have about 10 on my Kindle I have yet to read)
Nasty Little F!#*ERS
The Heart of an Assassin
The Old Man and The Wasteland