so i'm not from London, i live in Malmesbury, near(ish) to Bristol and Bath but on Thursday i have a day to spend in London before i pick some family up from Heathrow and i'm looking for some suggestions museum wise, i've done most of the standard ones and art ones but any hidden gems would be most appreciated.

sub-topic; do i go for a pint/coffee with the sister of someone i was with whilst traveling who is rather hot and living in London for a bit who has recently asked me if i'd like to do this via. Facebook?