London

Parks and Gardens
There are a ton of parks in London and these are just a few. You can also find a lot of botanical gardens like the Kew Gardens.
Hyde Park
St. James’s Park
In St. James's Park you'll find Buckingham Palace and St. James's Palace. I believe everyday they have the changing of the guard at Buckingham Palace. I haven't seen it since I was a little kid, so I don't really remember what it's like. But I would think it's something most tourists go to see.
Kensington Gardens
In Kensington Gardens you'll find Kensington Palace. It's also quite close to Notting Hill and Knightsbridge as well where you'll find Harrods.
Westminster
Houses of Parliament and Big Ben
Westminster Abbey
Trafalgar Square
National Gallery
Picadilly Circus
Covent Garden
Tower Hill
The Tower of London
Tower Bridge
St. Paul's Cathedral
Not really at Tower Hill, but close by.
Oxford, Bond, and Regent Street
Sort of a tourist trap, but tons of shops. Most of the stores on Oxford Street can be found on Kings Road and hopefully not as many tourists.
Galleries
National Gallery
Tate Britain
Tate Modern
Museums
I haven't been to many of the museums, but I have been to The Science Museum
and found it quite interesting. Just like everything else in London...there are tons.
Pubs
When it comes to pubs in London, there are so many. I can't say that I know of any specific Belgian Pubs (but I'm sure there are lots). I had to ask my brother for help...we go to different pubs everytime I'm in London...I can never remember any specific ones. He couldn't really tell me any specific pubs that you should go to, but you can find many great pubs in Notting Hill and along Kings Road. I know Covent Garden has several that we've been to. I think there's an Australian Pub there. It's not that easy remembering names of pubs after consuming a lot of beer...
A great site with a ton of information:
www.visitlondon.com