Going to London for two nights

daveyjp

Docklands to Greenwich, Maritime Museum, walk under the Thames in the tunnel or Clipper boat back to Westminster.

Skygarden is great for views, or the adjacent Monument.

Murphybear

Cherryfudge said:

We found the Premier Inn at Putney was cheaper than central ones which more than offset the extra Tube fares (if you pay by swiping your card as you go through, it's a maximum of £8.50 a day per adult, but I don't know how children fit into this system). Going on the Underground is part of the adventure that is London.

The Putney hotel had a good view of the Thames too, and was walking distance to the boat race route. I'm not on commission - honest - and I can't advise on stadium tours, but it may be worth looking at options like these.

I lived and worked in London for 25 years and used the tube a lot.  Big tip:  avoid the rush hour as it gets very crowded. It was bad when I lived there, 1971 -1996, it’s probably much worse now.  

Outside the rush hour it should be OK and I’m sure the children will love it.