Exploring. It's like Ducky and I have discussed before, too many people who come to London end up using the Tube (subway) to get around, even between places they could walk. By doing that they miss out on the hidden treasures on the way that would have made their trip to London all the more enjoyable.
We maintain the best way to see the city is to take a Tube into the middle, get off and walk around. Explore, and you'll learn why us Londoners love the city.
Glee or True Blood?