LONDON DUNGEONS
Madam Tussauds [but it gets packed]
The tombs [scary but never been]
Trocadero [amazing arcade/shop thing in West End]
London Eye
London Zoo
Tower of London
Science museum [its fun haha]
Brixton [haha just kidding its badd there]
and you could try go on an open top bus.. there fun
Have a great time!