I can't suggest one as I just can't so if I had to choose a select few instead, it would be Seasons (makes the worlds feel real and you get holidays), Cats and Dogs (because the world feels empty devoid of animals) and Dine Out (makes going on dates more interesting than the pub, or the park, again!)
Other ones I could do without if I needed to choose, but those in particular, for me, make the game feel like a life simulator, yes island living is nice, but I don't know what it adds to my game play other than a world with beaches, every day stuff like snowy weather and playing fetch with the dog is far more what I look for when I play.
