I'm not a huge Sci-Fi fan, but Anne McCaffrey's Pern books took me to a world that I just LOVE. Not a "high tech" Sci-Fi. A planet with dragons and people that ride them. Good characters. A great mental escape.
I've been re-reading all the Pern books (not in the proper order; I started with the last 3 and have now cycled back to the beginning) since Anne McCaffrey passed away. Incredible world and characters.