We went out to the old Olympic stadium, nothing much there to be honest but quite cool to see if you’re a stadium geek like I am. If you’re looking for something to see in the morning before getting on the beers again it might be worth considering. Can’t remember how we got there but think it was a short train journey.
There was a massive Jahovas witness conference or convention going on when we were there, it was quite the sight. Never converted though.