Walk through the Buckingham Palace grounds, admire Big Ben and Parliament Building, and hold your breath inside St. Pauls Cathedral. Keep a lookout for royalty, haggle at an open-air market, and eat a kabob from a roadside vendor. Marvel at the lack of high rises in one of THE cities of the world, and be surprised at the size (or lack thereof) of the Tower Bridge and the Thames.
Quick Tips:
If you are staying outside London and take the train in, know that many attraction tickets are 2-for-1 when you show the ticket.
Best Way To Get Around:
The tube will take you less than 10 minutes to figure out, and we never had to wait more than 5 minutes, even on a Sunday, for any train. Watch for the sudden and unadvertised cancellations, though.
Bus stops are clearly marked around major attractions. The stops are alphabetized, and every stop has a pole with a map of all the surrounding stops, the buses that stop at each of them, and the direction they are traveling.