London a beginners guide!

[Iwasjustasking]

I have never been to London and neither has my dh, we are finally taking the children (12 and 6) in half term, for one night two days. I don’t know where to start! We want to see

Houses of Parliament and 10 downing street
big ben
covent garden
Buckingham palace
Covent Garden
London bridge and the Thames (perhaps some kind of boat trip)
Hamleys and Harrods

i have no clue where these things are and what tube lines I need to get on and what order to do things? Can anyone help and anyone have any more must haves? Hotel is @ London Euston and that’s where the train will drop us too.

Every time I walk past the 2 red phone boxes opposite Big Ben, there are queues of tourists waiting to take selfies next to them. I was a bit bemused at first but I can see the charm - multiple London / UK icons in one shot.