Speaker's Corner in Hyde Park is really intense, people are all debating and preaching their beliefs, it's def worth visiting for students, believers of free speech or tourists who want a bit of amusement on a Sunday afternoon. Speaker's speak on Sunday afternoon normally between 1 and 6pm. Get off at Marble arch underground station and walk towards Hyde Park, you will bump into the crowd.
Icebar in London is amazing, glass of champagne and strawberry based cocktail in a glass made of ice, other than my fingers freezing to the point I couldn't bbm anymore it was fucking fun!