One of my favourite things about London is the underground transport system itself. I love the design of the information systems and the stations have so much history — some of them dating right back to the 1800s.
The Thai food scene in London is in an incredible place right now, with the likes of The Smoking Goat, Som Saa, The Begging Bowl and Farang all offering an experimental and delicious take on the cuisine. I'm focusing on the later a) because it's my local and b) because it's helmed by Seb Holmes, who's also cheffed at those others mentioned, and has managed to bring the best of all of them to Farang. Oh and c) the Gai Prik is probably the tastiest dish in London
The many book stores dotted along this strip can provide hours of inspiration. Aside from those selling new books, several specialise in second-hand and antiquarian books.