What Sim Games Do You Recommend?

     I like the idea of sim games. Simulating an experience that may or may not be readily available to you in reality. Thing is, I have only played the most obvious sim game: The Sims. Not any of the expansions, nor the sequels. Just the originals Sims game. My question is what kind of sim games have you all played that you absolutely enjoyed? It can be any kind of sim. Seeing this week is Valentine's Day, I'm sure someone has a good dating sim game on their mind. Be sure to list what platform it is for and if it is a PC game not on Steam, list the website or retail store to obtain it.