12: The food
17: Decent food at the convenience store
19: Onigiri

Kind of cheating to have three variations of "food," but yes, this is a big one. I miss zarusoba, tsukemen, okaka onigiri, mugicha, a big bowl of shoyuu ramen with gyoza and fried rice…

Even more than the food, though, I miss having every-day opportunities to practice the language.