I have to book a flight and hotel for a work conference in April. I will be staying in the St. Pancras area so which airport would be eaiser to fly into? Also, I was going to make a weekend out of it (since I have never really been to London save a few hours) but sadly, I will be on my own. So I decided just to fly in the day before and will go back when I have someone to explore with. What can one do on Sunday afternoon/night on their own in London?