Take a stroll through Kensington Gardens for me. And drink the Stout – all the beer is relatively warm, and with the Stout it really adds to the flavor.
Also try to eat at a decent Indian restaurant – London has some excellent Indian food.
Nice one Captain – welcome to London 
Its a tad cold at the moment though and very overcast so be warned! Best Indians are in Brick Lane, but probably more convenient are the ones in Soho and they are generally quite good too.
One thing you MUST do while you are here is the “Original Bus Tour” – its an open-topped bus tour taking in all the major points of the city with a hop-on-hop-off ticket. It’s well worth it I promise. Best place to get it from is between Leicester Square and Piccadilly Circus in the West End. You just turn up atthe bus stop (which are all clearly labelled as “The Original Tour”) and buy a ticket – or family ticket probably in your case!
Tower of London is well worth a visit too. Those are the two things i’d best recommend. The London Eye is very good too.
Cheers
Simmo!
PS. You have a very nice place over there by the way…I’m jealous 