✔ 最佳答案
Even though it sounds touristy, the first thing I do in big cities is hop on the Big Bus. It is very helpful in orienting yourself, and will give you ideas on what you want to see. Usually your ticket is good for 24 hours and you can hop on or off at any stop.
Also,
www.londonpass.com has quite a bit of info. If you plan on cramming a bunch of stuff in while you're there, it can also be cheaper if you get the pass.
Here are some of my favorites: Madame Tussaud's, Trafalgar Square (within walking distance of Buckingham Palace), Kensington Palace, Millenium Eye, Westminster Abbey, Tower of London, Phantom of the Opera (sometimes you can get cheap tix for matinees), Hyde Park, the Cutty Sark. Good daytrips are Hampton Court Palace, Stonehenge, Windsor Castle. I never worry about where to eat - you'll stumble onto something. Ask your Big Bus driver about street shopping - they will lead you in the right direction! Have fun!