Bored of London, Bored of Life
Yes, I stole that title from a book, but it's true! If you ever get tired of this city, then you are a though cookie... This city is amazing, with something for everyone (a thousand things for everyone, even!). Museums, architecture, culture, nature, activities, tours, things to do... You could do a different activity in London each day of the year, and never run out. Plenty of pubs to explore, and food is more varied and tasty than it's reputation. In short: LOVE THIS CITY!
Insider Tip:Go out in different areas of London, there are plenty of pubs and bars in ever borough, and they're all very different from each other :)