Who Has Two Thumbs And Is Going To London?

Finally I am done with my exams, so now I can enjoy my free days. Tonight I am going to the Hunger Games with my friends and my little sister. And this Saturday I am going to London with school. I am soooo excited, it is going to be my first time in London. And we have like six hours spare time. So if you have any tips of places that are a must to go to. Please let me know! XX