It has been awhile since I was there. I remember it is a beautiful place with tons of culture.
Jamo pretty much gave you a great list. The museum is definitely not to be missed.
St. Paul's Cathedral is the most beautiful Church I have ever set foot in.
We also went to Stratford Upon Avon for the day and enjoyed that trip.
You simply must ride the train. 200 MPH is cool & Smooth as a babies butt!
I thought Madame Tussauds was a neat place.
Windsor Palace if the Royal Family is there.
Buckingham Palace -Of course you need to see the changing if the guards.
Tower Bridge is on the river and has easy access. Great photo opp!
Go down to ??? (someone help me here) Lower London ???? and see the dungeons and torture chambers. They are museums now. You will be amazed at what humans once did to each other.
The taxi cabs are a great way to get around. The tube is better and
a lot less $$$$. Be very careful about which station you get off in and at what time. ASK QUESTIONS. Sometimes the tourist become targets after dark if they have cameras hanging around their necks. Seriously, ask which stations you should stay out of after dark.
Over all London is a great and safe and enjoyable place, just watch yourself after dark. I would love to go back there with my wife & kids.
I remember the food not being bad at all. The beer is dark and at room temperature. Do Not ask for a cold beer, they'll laugh you outta the place.
. Also they do not serve ice in your tea unless you ask for it.
It is a great place and you are in for a treat.
Enjoy!