Yesterday I decided to take the advice of Karl and Caroline and take a trip down to Greenwich with one of the many ferries that cruise up and down the river. It is a great way of getting to Greenwich as you get to see all the interesting sights by the river and some of them even give you a guided tour. Better yet you can get one third off the ticket price (at least from one of the companies) if you show your Travelcard or Oyster card. The other alternative is the Docklands Light Rail (DLR) which is probably faster, but is not as nice a journey.
Although Greenwich is not in the middle of London, bordering on the outskirts of zone two, there is still plenty to keep you entertained. I visited the National Maritime Museum which I found pretty interested because England had the strongest naval forces in the world for such a long time in the past. Stretching out behind the Maritime Museum you can find Greenwich Park which is yet another really nice park to sit and pass the time. Towering above the park, is the Royal Observatory that marks the location of the Prime Meridian of the World, and is the point for Greenwich Mean Time. It is definitely worth going up to the hill for both the Observatory as well as the good viewing location for the rest of London. If you run out of things to look at, you should also probably drop into the Greenwich markets which are housed close to where the ferries drop you off. They are not as big as many of the markets that I have been to, but I’m sure you could find something of interest to buy there.