My favorite type of game is a tie between FPS/RPG. I really like very competitive FPS games, however chilling to some Skyrim or Fallout is really great. I also like the type of RPG like Final Fantasy and Fire Emblem. However playing some Zelda is just phenomenal.
Like Biker and Rowcon said. Definitely play Fallout, I've never played Fallout 3, however New Vegas is one of my favorite games. I have a warning for you, New Vegas has issues on PC. Such as it sometimes won't simply work. Go and do some research on in advance.