If you could tell us the bunch of things you are going to do - Then we can tell you about other things you could do
Seriously, If I said take a bus tour of the city and you said I'm gonna do that as one of the bunch of things to do - then I'd feel foolish
I take short trips to London -- I see a play - Meet friends, and go to a pub one night with old acquaintances - Fly back to New York.
Do Visit the British Museum,Tower of London,Harrods,British Library,HydePark .....