In addition to all the great reads mentioned above, I'll point out one of my favorites --- The Helliconia Trilogy by Brian Aldiss:
Helliconia Spring
Helliconia Summer
Helliconia Winter
I don't know quite how to describe it --- SF? Fantasy? Most of the trilogy is about hunter-gatherer shenanigans, but then there is a sudden disconnect as Aldiss talks about a space station of observers revolving the planet and reporting back to earth. I personally thought that this angle didn't add much to the storyline --- any other opinions on this?
