I know it's the normal tourist stuff, but I really enjoyed the Tower of London and the Cabinet War Rooms. My wife really liked the tour at the reconstruction of the Globe theatre, but she was a theatre major in school.

We also took a day trip out to Stonehenge and Salisbury. I really enjoyed the tower tour at Salisbury Cathedral. Stonehenge was only ok...It pretty much looks like the pictures and they just have audio tours.

Congratulations and have fun. Plan on sleeping a bit the first day.