[Disclaimer: these are not in any particular order.]
1. Piazzle Michaelangelo. This is a Piazza situated in the southeast corner of the city, across the Arno River. From it, you have the absolute best view of the entire city of Florence. It is quite a walk from my apartment (probably several kilometers), and requires climbing several deceptively steep stairs, but as you can see, the view on a beautiful day is quite worth it.
2. The food. Obviously. I think I have made all of you drool enough with my apparently torturous photos of the food here; you get the point. Everything from the pasta to the gelato to the chocolate to the fresh vegetables is DELICIOUS. Even when I've been disappointed at a restaurant, everything is still a far cry from the chemically infused substances that Americans call food. I think that this will be the biggest problem I have in coming back.